Merge branch 'i2c/for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c updates from Wolfram Sang:
 "New stuff from the I2C world:

   - in the core, getting irqs from ACPI is now similar to OF

   - new driver for MediaTek MT7621/7628/7688 SoCs

   - bcm2835, i801, and tegra drivers got some more attention

   - GPIO API cleanups

   - cleanups in the core headers

   - lots of usual driver updates"

* 'i2c/for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (74 commits)
  i2c: mt7621: Fix platform_no_drv_owner.cocci warnings
  i2c: cpm: remove casting dma_alloc
  dt-bindings: i2c: sun6i-p2wi: Fix the binding example
  dt-bindings: i2c: mv64xxx: Fix the example compatible
  i2c: i801: Documentation update
  i2c: i801: Add support for Intel Tiger Lake
  i2c: i801: Fix PCI ID sorting
  dt-bindings: i2c-stm32: document optional dmas
  i2c: i2c-stm32f7: Add I2C_SMBUS_I2C_BLOCK_DATA support
  i2c: core: Tidy up handling of init_irq
  i2c: core: Move ACPI gpio IRQ handling into i2c_acpi_get_irq
  i2c: core: Move ACPI IRQ handling to probe time
  i2c: acpi: Factor out getting the IRQ from ACPI
  i2c: acpi: Use available IRQ helper functions
  i2c: core: Allow whole core to use i2c_dev_irq_from_resources
  eeprom: at24: modify a comment referring to platform data
  dt-bindings: i2c: omap: Add new compatible for J721E SoCs
  dt-bindings: i2c: mv64xxx: Add YAML schemas
  dt-bindings: i2c: sun6i-p2wi: Add YAML schemas
  i2c: mt7621: Add MediaTek MT7621/7628/7688 I2C driver
  ...

drivers/i2c/busses/Kconfig

@@ -143,6 +143,8 @@ config I2C_I801
 	    Cedar Fork (PCH)
 	    Ice Lake (PCH)
 	    Comet Lake (PCH)
+	    Elkhart Lake (PCH)
+	    Tiger Lake (PCH)
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-i801.
@@ -436,7 +438,7 @@ config I2C_AXXIA
 
 config I2C_BCM2835
 	tristate "Broadcom BCM2835 I2C controller"
-	depends on ARCH_BCM2835
+	depends on ARCH_BCM2835 || ARCH_BRCMSTB
 	help
 	  If you say yes to this option, support will be included for the
 	  BCM2835 I2C controller.
@@ -692,7 +694,7 @@ config I2C_IOP3XX
 
 config I2C_JZ4780
 	tristate "JZ4780 I2C controller interface support"
-	depends on MACH_JZ4780 || COMPILE_TEST
+	depends on MIPS || COMPILE_TEST
 	help
 	 If you say yes to this option, support will be included for the
 	 Ingenic JZ4780 I2C controller.
@@ -746,6 +748,13 @@ config I2C_MT65XX
 	  If you want to use MediaTek(R) I2C interface, say Y or M here.
 	  If unsure, say N.
 
+config I2C_MT7621
+	tristate "MT7621/MT7628 I2C Controller"
+	depends on (RALINK && (SOC_MT7620 || SOC_MT7621)) || COMPILE_TEST
+	help
+	  Say Y here to include support for I2C controller in the
+	  MediaTek MT7621/MT7628 SoCs.
+
 config I2C_MV64XXX
 	tristate "Marvell mv64xxx I2C Controller"
 	depends on MV64X60 || PLAT_ORION || ARCH_SUNXI || ARCH_MVEBU

drivers/i2c/busses/Makefile

@@ -77,6 +77,7 @@ obj-$(CONFIG_I2C_LPC2K)		+= i2c-lpc2k.o
 obj-$(CONFIG_I2C_MESON)		+= i2c-meson.o
 obj-$(CONFIG_I2C_MPC)		+= i2c-mpc.o
 obj-$(CONFIG_I2C_MT65XX)	+= i2c-mt65xx.o
+obj-$(CONFIG_I2C_MT7621)	+= i2c-mt7621.o
 obj-$(CONFIG_I2C_MV64XXX)	+= i2c-mv64xxx.o
 obj-$(CONFIG_I2C_MXS)		+= i2c-mxs.o
 obj-$(CONFIG_I2C_NOMADIK)	+= i2c-nomadik.o

drivers/i2c/busses/i2c-bcm-iproc.c

@@ -165,12 +165,6 @@ enum i2c_slave_read_status {
 	I2C_SLAVE_RX_END,
 };
 
-enum i2c_slave_xfer_dir {
-	I2C_SLAVE_DIR_READ = 0,
-	I2C_SLAVE_DIR_WRITE,
-	I2C_SLAVE_DIR_NONE,
-};
-
 enum bus_speed_index {
 	I2C_SPD_100K = 0,
 	I2C_SPD_400K,
@@ -203,7 +197,6 @@ struct bcm_iproc_i2c_dev {
 	struct i2c_msg *msg;
 
 	struct i2c_client *slave;
-	enum i2c_slave_xfer_dir xfer_dir;
 
 	/* bytes that have been transferred */
 	unsigned int tx_bytes;
@@ -219,7 +212,8 @@ struct bcm_iproc_i2c_dev {
 		| BIT(IS_M_RX_THLD_SHIFT))
 
 #define ISR_MASK_SLAVE (BIT(IS_S_START_BUSY_SHIFT)\
-		| BIT(IS_S_RX_EVENT_SHIFT) | BIT(IS_S_RD_EVENT_SHIFT))
+		| BIT(IS_S_RX_EVENT_SHIFT) | BIT(IS_S_RD_EVENT_SHIFT)\
+		| BIT(IS_S_TX_UNDERRUN_SHIFT))
 
 static int bcm_iproc_i2c_reg_slave(struct i2c_client *slave);
 static int bcm_iproc_i2c_unreg_slave(struct i2c_client *slave);
@@ -297,15 +291,11 @@ static void bcm_iproc_i2c_slave_init(
 	/* clear all pending slave interrupts */
 	iproc_i2c_wr_reg(iproc_i2c, IS_OFFSET, ISR_MASK_SLAVE);
 
-	/* Enable interrupt register for any READ event */
-	val = BIT(IE_S_RD_EVENT_SHIFT);
 	/* Enable interrupt register to indicate a valid byte in receive fifo */
-	val |= BIT(IE_S_RX_EVENT_SHIFT);
+	val = BIT(IE_S_RX_EVENT_SHIFT);
 	/* Enable interrupt register for the Slave BUSY command */
 	val |= BIT(IE_S_START_BUSY_SHIFT);
 	iproc_i2c_wr_reg(iproc_i2c, IE_OFFSET, val);
-
-	iproc_i2c->xfer_dir = I2C_SLAVE_DIR_NONE;
 }
 
 static void bcm_iproc_i2c_check_slave_status(
@@ -314,8 +304,11 @@ static void bcm_iproc_i2c_check_slave_status(
 	u32 val;
 
 	val = iproc_i2c_rd_reg(iproc_i2c, S_CMD_OFFSET);
-	val = (val >> S_CMD_STATUS_SHIFT) & S_CMD_STATUS_MASK;
+	/* status is valid only when START_BUSY is cleared after it was set */
+	if (val & BIT(S_CMD_START_BUSY_SHIFT))
+		return;
 
+	val = (val >> S_CMD_STATUS_SHIFT) & S_CMD_STATUS_MASK;
 	if (val == S_CMD_STATUS_TIMEOUT) {
 		dev_err(iproc_i2c->device, "slave random stretch time timeout\n");
 
@@ -327,70 +320,66 @@ static void bcm_iproc_i2c_check_slave_status(
 }
 
 static bool bcm_iproc_i2c_slave_isr(struct bcm_iproc_i2c_dev *iproc_i2c,
-				u32 status)
+				    u32 status)
 {
-	u8 value;
 	u32 val;
-	u32 rd_status;
-	u32 tmp;
+	u8 value, rx_status;
 
-	/* Start of transaction. check address and populate the direction */
-	if (iproc_i2c->xfer_dir == I2C_SLAVE_DIR_NONE) {
-		tmp = iproc_i2c_rd_reg(iproc_i2c, S_RX_OFFSET);
-		rd_status = (tmp >> S_RX_STATUS_SHIFT) & S_RX_STATUS_MASK;
-		/* This condition checks whether the request is a new request */
-		if (((rd_status == I2C_SLAVE_RX_START) &&
-			(status & BIT(IS_S_RX_EVENT_SHIFT))) ||
-			((rd_status == I2C_SLAVE_RX_END) &&
-			(status & BIT(IS_S_RD_EVENT_SHIFT)))) {
-
-			/* Last bit is W/R bit.
-			 * If 1 then its a read request(by master).
-			 */
-			iproc_i2c->xfer_dir = tmp & SLAVE_READ_WRITE_BIT_MASK;
-			if (iproc_i2c->xfer_dir == I2C_SLAVE_DIR_WRITE)
-				i2c_slave_event(iproc_i2c->slave,
-					I2C_SLAVE_READ_REQUESTED, &value);
-			else
-				i2c_slave_event(iproc_i2c->slave,
+	/* Slave RX byte receive */
+	if (status & BIT(IS_S_RX_EVENT_SHIFT)) {
+		val = iproc_i2c_rd_reg(iproc_i2c, S_RX_OFFSET);
+		rx_status = (val >> S_RX_STATUS_SHIFT) & S_RX_STATUS_MASK;
+		if (rx_status == I2C_SLAVE_RX_START) {
+			/* Start of SMBUS for Master write */
+			i2c_slave_event(iproc_i2c->slave,
 					I2C_SLAVE_WRITE_REQUESTED, &value);
+
+			val = iproc_i2c_rd_reg(iproc_i2c, S_RX_OFFSET);
+			value = (u8)((val >> S_RX_DATA_SHIFT) & S_RX_DATA_MASK);
+			i2c_slave_event(iproc_i2c->slave,
+					I2C_SLAVE_WRITE_RECEIVED, &value);
+		} else if (status & BIT(IS_S_RD_EVENT_SHIFT)) {
+			/* Start of SMBUS for Master Read */
+			i2c_slave_event(iproc_i2c->slave,
+					I2C_SLAVE_READ_REQUESTED, &value);
+			iproc_i2c_wr_reg(iproc_i2c, S_TX_OFFSET, value);
+
+			val = BIT(S_CMD_START_BUSY_SHIFT);
+			iproc_i2c_wr_reg(iproc_i2c, S_CMD_OFFSET, val);
+
+			/*
+			 * Enable interrupt for TX FIFO becomes empty and
+			 * less than PKT_LENGTH bytes were output on the SMBUS
+			 */
+			val = iproc_i2c_rd_reg(iproc_i2c, IE_OFFSET);
+			val |= BIT(IE_S_TX_UNDERRUN_SHIFT);
+			iproc_i2c_wr_reg(iproc_i2c, IE_OFFSET, val);
+		} else {
+			/* Master write other than start */
+			value = (u8)((val >> S_RX_DATA_SHIFT) & S_RX_DATA_MASK);
+			i2c_slave_event(iproc_i2c->slave,
+					I2C_SLAVE_WRITE_RECEIVED, &value);
 		}
-	}
-
-	/* read request from master */
-	if ((status & BIT(IS_S_RD_EVENT_SHIFT)) &&
-		(iproc_i2c->xfer_dir == I2C_SLAVE_DIR_WRITE)) {
+	} else if (status & BIT(IS_S_TX_UNDERRUN_SHIFT)) {
+		/* Master read other than start */
 		i2c_slave_event(iproc_i2c->slave,
-			I2C_SLAVE_READ_PROCESSED, &value);
-		iproc_i2c_wr_reg(iproc_i2c, S_TX_OFFSET, value);
+				I2C_SLAVE_READ_PROCESSED, &value);
 
+		iproc_i2c_wr_reg(iproc_i2c, S_TX_OFFSET, value);
 		val = BIT(S_CMD_START_BUSY_SHIFT);
 		iproc_i2c_wr_reg(iproc_i2c, S_CMD_OFFSET, val);
 	}
 
-	/* write request from master */
-	if ((status & BIT(IS_S_RX_EVENT_SHIFT)) &&
-		(iproc_i2c->xfer_dir == I2C_SLAVE_DIR_READ)) {
-		val = iproc_i2c_rd_reg(iproc_i2c, S_RX_OFFSET);
-		/* Its a write request by Master to Slave.
-		 * We read data present in receive FIFO
-		 */
-		value = (u8)((val >> S_RX_DATA_SHIFT) & S_RX_DATA_MASK);
-		i2c_slave_event(iproc_i2c->slave,
-			I2C_SLAVE_WRITE_RECEIVED, &value);
-
-		/* check the status for the last byte of the transaction */
-		rd_status = (val >> S_RX_STATUS_SHIFT) & S_RX_STATUS_MASK;
-		if (rd_status == I2C_SLAVE_RX_END)
-			iproc_i2c->xfer_dir = I2C_SLAVE_DIR_NONE;
-
-		dev_dbg(iproc_i2c->device, "\nread value = 0x%x\n", value);
-	}
-
 	/* Stop */
 	if (status & BIT(IS_S_START_BUSY_SHIFT)) {
 		i2c_slave_event(iproc_i2c->slave, I2C_SLAVE_STOP, &value);
-		iproc_i2c->xfer_dir = I2C_SLAVE_DIR_NONE;
+		/*
+		 * Enable interrupt for TX FIFO becomes empty and
+		 * less than PKT_LENGTH bytes were output on the SMBUS
+		 */
+		val = iproc_i2c_rd_reg(iproc_i2c, IE_OFFSET);
+		val &= ~BIT(IE_S_TX_UNDERRUN_SHIFT);
+		iproc_i2c_wr_reg(iproc_i2c, IE_OFFSET, val);
 	}
 
 	/* clear interrupt status */

drivers/i2c/busses/i2c-bcm2835.c

@@ -4,6 +4,8 @@
  */
 
 #include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
 #include <linux/completion.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
@@ -51,9 +53,7 @@
 struct bcm2835_i2c_dev {
 	struct device *dev;
 	void __iomem *regs;
-	struct clk *clk;
 	int irq;
-	u32 bus_clk_rate;
 	struct i2c_adapter adapter;
 	struct completion completion;
 	struct i2c_msg *curr_msg;
@@ -74,12 +74,17 @@ static inline u32 bcm2835_i2c_readl(struct bcm2835_i2c_dev *i2c_dev, u32 reg)
 	return readl(i2c_dev->regs + reg);
 }
 
-static int bcm2835_i2c_set_divider(struct bcm2835_i2c_dev *i2c_dev)
-{
-	u32 divider, redl, fedl;
+#define to_clk_bcm2835_i2c(_hw) container_of(_hw, struct clk_bcm2835_i2c, hw)
+struct clk_bcm2835_i2c {
+	struct clk_hw hw;
+	struct bcm2835_i2c_dev *i2c_dev;
+};
+
+static int clk_bcm2835_i2c_calc_divider(unsigned long rate,
+				unsigned long parent_rate)
+{
+	u32 divider = DIV_ROUND_UP(parent_rate, rate);
 
-	divider = DIV_ROUND_UP(clk_get_rate(i2c_dev->clk),
-			       i2c_dev->bus_clk_rate);
 	/*
 	 * Per the datasheet, the register is always interpreted as an even
 	 * number, by rounding down. In other words, the LSB is ignored. So,
@@ -88,12 +93,23 @@ static int bcm2835_i2c_set_divider(struct bcm2835_i2c_dev *i2c_dev)
 	if (divider & 1)
 		divider++;
 	if ((divider < BCM2835_I2C_CDIV_MIN) ||
-	    (divider > BCM2835_I2C_CDIV_MAX)) {
-		dev_err_ratelimited(i2c_dev->dev, "Invalid clock-frequency\n");
+	    (divider > BCM2835_I2C_CDIV_MAX))
 		return -EINVAL;
-	}
 
-	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_DIV, divider);
+	return divider;
+}
+
+static int clk_bcm2835_i2c_set_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long parent_rate)
+{
+	struct clk_bcm2835_i2c *div = to_clk_bcm2835_i2c(hw);
+	u32 redl, fedl;
+	u32 divider = clk_bcm2835_i2c_calc_divider(rate, parent_rate);
+
+	if (divider == -EINVAL)
+		return -EINVAL;
+
+	bcm2835_i2c_writel(div->i2c_dev, BCM2835_I2C_DIV, divider);
 
 	/*
 	 * Number of core clocks to wait after falling edge before
@@ -108,12 +124,65 @@ static int bcm2835_i2c_set_divider(struct bcm2835_i2c_dev *i2c_dev)
 	 */
 	redl = max(divider / 4, 1u);
 
-	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_DEL,
+	bcm2835_i2c_writel(div->i2c_dev, BCM2835_I2C_DEL,
 			   (fedl << BCM2835_I2C_FEDL_SHIFT) |
 			   (redl << BCM2835_I2C_REDL_SHIFT));
 	return 0;
 }
 
+static long clk_bcm2835_i2c_round_rate(struct clk_hw *hw, unsigned long rate,
+				unsigned long *parent_rate)
+{
+	u32 divider = clk_bcm2835_i2c_calc_divider(rate, *parent_rate);
+
+	return DIV_ROUND_UP(*parent_rate, divider);
+}
+
+static unsigned long clk_bcm2835_i2c_recalc_rate(struct clk_hw *hw,
+						unsigned long parent_rate)
+{
+	struct clk_bcm2835_i2c *div = to_clk_bcm2835_i2c(hw);
+	u32 divider = bcm2835_i2c_readl(div->i2c_dev, BCM2835_I2C_DIV);
+
+	return DIV_ROUND_UP(parent_rate, divider);
+}
+
+static const struct clk_ops clk_bcm2835_i2c_ops = {
+	.set_rate = clk_bcm2835_i2c_set_rate,
+	.round_rate = clk_bcm2835_i2c_round_rate,
+	.recalc_rate = clk_bcm2835_i2c_recalc_rate,
+};
+
+static struct clk *bcm2835_i2c_register_div(struct device *dev,
+					struct clk *mclk,
+					struct bcm2835_i2c_dev *i2c_dev)
+{
+	struct clk_init_data init;
+	struct clk_bcm2835_i2c *priv;
+	char name[32];
+	const char *mclk_name;
+
+	snprintf(name, sizeof(name), "%s_div", dev_name(dev));
+
+	mclk_name = __clk_get_name(mclk);
+
+	init.ops = &clk_bcm2835_i2c_ops;
+	init.name = name;
+	init.parent_names = (const char* []) { mclk_name };
+	init.num_parents = 1;
+	init.flags = 0;
+
+	priv = devm_kzalloc(dev, sizeof(struct clk_bcm2835_i2c), GFP_KERNEL);
+	if (priv == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	priv->hw.init = &init;
+	priv->i2c_dev = i2c_dev;
+
+	clk_hw_register_clkdev(&priv->hw, "div", dev_name(dev));
+	return devm_clk_register(dev, &priv->hw);
+}
+
 static void bcm2835_fill_txfifo(struct bcm2835_i2c_dev *i2c_dev)
 {
 	u32 val;
@@ -271,7 +340,7 @@ static int bcm2835_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
 {
 	struct bcm2835_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
 	unsigned long time_left;
-	int i, ret;
+	int i;
 
 	for (i = 0; i < (num - 1); i++)
 		if (msgs[i].flags & I2C_M_RD) {
@@ -280,10 +349,6 @@ static int bcm2835_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
 			return -EOPNOTSUPP;
 		}
 
-	ret = bcm2835_i2c_set_divider(i2c_dev);
-	if (ret)
-		return ret;
-
 	i2c_dev->curr_msg = msgs;
 	i2c_dev->num_msgs = num;
 	reinit_completion(&i2c_dev->completion);
@@ -338,6 +403,9 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
 	struct resource *mem, *irq;
 	int ret;
 	struct i2c_adapter *adap;
+	struct clk *bus_clk;
+	struct clk *mclk;
+	u32 bus_clk_rate;
 
 	i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
 	if (!i2c_dev)
@@ -351,19 +419,38 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
 	if (IS_ERR(i2c_dev->regs))
 		return PTR_ERR(i2c_dev->regs);
 
-	i2c_dev->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(i2c_dev->clk)) {
-		if (PTR_ERR(i2c_dev->clk) != -EPROBE_DEFER)
+	mclk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(mclk)) {
+		if (PTR_ERR(mclk) != -EPROBE_DEFER)
 			dev_err(&pdev->dev, "Could not get clock\n");
-		return PTR_ERR(i2c_dev->clk);
+		return PTR_ERR(mclk);
+	}
+
+	bus_clk = bcm2835_i2c_register_div(&pdev->dev, mclk, i2c_dev);
+
+	if (IS_ERR(bus_clk)) {
+		dev_err(&pdev->dev, "Could not register clock\n");
+		return PTR_ERR(bus_clk);
 	}
 
 	ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
-				   &i2c_dev->bus_clk_rate);
+				   &bus_clk_rate);
 	if (ret < 0) {
 		dev_warn(&pdev->dev,
 			 "Could not read clock-frequency property\n");
-		i2c_dev->bus_clk_rate = 100000;
+		bus_clk_rate = 100000;
+	}
+
+	ret = clk_set_rate_exclusive(bus_clk, bus_clk_rate);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Could not set clock frequency\n");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(bus_clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't prepare clock");
+		return ret;
 	}
 
 	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
@@ -402,6 +489,10 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
 static int bcm2835_i2c_remove(struct platform_device *pdev)
 {
 	struct bcm2835_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+	struct clk *bus_clk = devm_clk_get(i2c_dev->dev, "div");
+
+	clk_rate_exclusive_put(bus_clk);
+	clk_disable_unprepare(bus_clk);
 
 	free_irq(i2c_dev->irq, i2c_dev);
 	i2c_del_adapter(&i2c_dev->adapter);

drivers/i2c/busses/i2c-cpm.c

@@ -531,7 +531,9 @@ static int cpm_i2c_setup(struct cpm_i2c *cpm)
 		}
 		out_be32(&rbdf[i].cbd_bufaddr, ((cpm->rxdma[i] + 1) & ~1));
 
-		cpm->txbuf[i] = (unsigned char *)dma_alloc_coherent(&cpm->ofdev->dev, CPM_MAX_READ + 1, &cpm->txdma[i], GFP_KERNEL);
+		cpm->txbuf[i] = dma_alloc_coherent(&cpm->ofdev->dev,
+						   CPM_MAX_READ + 1,
+						   &cpm->txdma[i], GFP_KERNEL);
 		if (!cpm->txbuf[i]) {
 			ret = -ENOMEM;
 			goto out_muram;

drivers/i2c/busses/i2c-fsi.c

@@ -658,13 +658,29 @@ static const struct i2c_algorithm fsi_i2c_algorithm = {
 	.functionality = fsi_i2c_functionality,
 };
 
+static struct device_node *fsi_i2c_find_port_of_node(struct device_node *fsi,
+						     int port)
+{
+	struct device_node *np;
+	u32 port_no;
+	int rc;
+
+	for_each_child_of_node(fsi, np) {
+		rc = of_property_read_u32(np, "reg", &port_no);
+		if (!rc && port_no == port)
+			return np;
+	}
+
+	return NULL;
+}
+
 static int fsi_i2c_probe(struct device *dev)
 {
 	struct fsi_i2c_master *i2c;
 	struct fsi_i2c_port *port;
 	struct device_node *np;
+	u32 port_no, ports, stat;
 	int rc;
-	u32 port_no;
 
 	i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
 	if (!i2c)
@@ -678,10 +694,16 @@ static int fsi_i2c_probe(struct device *dev)
 	if (rc)
 		return rc;
 
-	/* Add adapter for each i2c port of the master. */
-	for_each_available_child_of_node(dev->of_node, np) {
-		rc = of_property_read_u32(np, "reg", &port_no);
-		if (rc || port_no > USHRT_MAX)
+	rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat);
+	if (rc)
+		return rc;
+
+	ports = FIELD_GET(I2C_STAT_MAX_PORT, stat) + 1;
+	dev_dbg(dev, "I2C master has %d ports\n", ports);
+
+	for (port_no = 0; port_no < ports; port_no++) {
+		np = fsi_i2c_find_port_of_node(dev->of_node, port_no);
+		if (np && !of_device_is_available(np))
 			continue;
 
 		port = kzalloc(sizeof(*port), GFP_KERNEL);

drivers/i2c/busses/i2c-i801.c

@@ -64,12 +64,14 @@
  * Cedar Fork (PCH)		0x18df	32	hard	yes	yes	yes
  * Ice Lake-LP (PCH)		0x34a3	32	hard	yes	yes	yes
  * Comet Lake (PCH)		0x02a3	32	hard	yes	yes	yes
+ * Elkhart Lake (PCH)		0x4b23	32	hard	yes	yes	yes
+ * Tiger Lake-LP (PCH)		0xa0a3	32	hard	yes	yes	yes
  *
  * Features supported by this driver:
  * Software PEC				no
  * Hardware PEC				yes
  * Block buffer				yes
- * Block process call transaction	no
+ * Block process call transaction	yes
  * I2C block read transaction		yes (doesn't use the block buffer)
  * Slave mode				no
  * SMBus Host Notify			yes
@@ -92,6 +94,7 @@
 #include <linux/io.h>
 #include <linux/dmi.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include <linux/wait.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
@@ -99,7 +102,7 @@
 #include <linux/pm_runtime.h>
 
 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
-#include <linux/gpio.h>
+#include <linux/gpio/machine.h>
 #include <linux/platform_data/i2c-mux-gpio.h>
 #endif
 
@@ -169,6 +172,7 @@
 #define I801_PROC_CALL		0x10	/* unimplemented */
 #define I801_BLOCK_DATA		0x14
 #define I801_I2C_BLOCK_DATA	0x18	/* ICH5 and later */
+#define I801_BLOCK_PROC_CALL	0x1C
 
 /* I801 Host Control register bits */
 #define SMBHSTCNT_INTREN	BIT(0)
@@ -200,6 +204,7 @@
 				 STATUS_ERROR_FLAGS)
 
 /* Older devices have their ID defined in <linux/pci_ids.h> */
+#define PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS		0x02a3
 #define PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS		0x0f12
 #define PCI_DEVICE_ID_INTEL_CDF_SMBUS			0x18df
 #define PCI_DEVICE_ID_INTEL_DNV_SMBUS			0x19df
@@ -217,6 +222,7 @@
 #define PCI_DEVICE_ID_INTEL_GEMINILAKE_SMBUS		0x31d4
 #define PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS		0x34a3
 #define PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS		0x3b30
+#define PCI_DEVICE_ID_INTEL_ELKHART_LAKE_SMBUS		0x4b23
 #define PCI_DEVICE_ID_INTEL_BROXTON_SMBUS		0x5ad4
 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS		0x8c22
 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS		0x8ca2
@@ -228,12 +234,12 @@
 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS	0x9ca2
 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS	0x9d23
 #define PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS		0x9da3
+#define PCI_DEVICE_ID_INTEL_TIGERLAKE_LP_SMBUS		0xa0a3
 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS	0xa123
 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS		0xa1a3
 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS	0xa223
 #define PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS	0xa2a3
 #define PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS		0xa323
-#define PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS		0x02a3
 
 struct i801_mux_config {
 	char *gpio_chip;
@@ -266,6 +272,7 @@ struct i801_priv {
 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
 	const struct i801_mux_config *mux_drvdata;
 	struct platform_device *mux_pdev;
+	struct gpiod_lookup_table *lookup;
 #endif
 	struct platform_device *tco_pdev;
 
@@ -509,10 +516,23 @@ static int i801_transaction(struct i801_priv *priv, int xact)
 
 static int i801_block_transaction_by_block(struct i801_priv *priv,
 					   union i2c_smbus_data *data,
-					   char read_write, int hwpec)
+					   char read_write, int command,
+					   int hwpec)
 {
 	int i, len;
 	int status;
+	int xact = hwpec ? SMBHSTCNT_PEC_EN : 0;
+
+	switch (command) {
+	case I2C_SMBUS_BLOCK_PROC_CALL:
+		xact |= I801_BLOCK_PROC_CALL;
+		break;
+	case I2C_SMBUS_BLOCK_DATA:
+		xact |= I801_BLOCK_DATA;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
 
 	inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
 
@@ -524,12 +544,12 @@ static int i801_block_transaction_by_block(struct i801_priv *priv,
 			outb_p(data->block[i+1], SMBBLKDAT(priv));
 	}
 
-	status = i801_transaction(priv, I801_BLOCK_DATA |
-				  (hwpec ? SMBHSTCNT_PEC_EN : 0));
+	status = i801_transaction(priv, xact);
 	if (status)
 		return status;
 
-	if (read_write == I2C_SMBUS_READ) {
+	if (read_write == I2C_SMBUS_READ ||
+	    command == I2C_SMBUS_BLOCK_PROC_CALL) {
 		len = inb_p(SMBHSTDAT0(priv));
 		if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
 			return -EPROTO;
@@ -667,6 +687,9 @@ static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
 	int result;
 	const struct i2c_adapter *adap = &priv->adapter;
 
+	if (command == I2C_SMBUS_BLOCK_PROC_CALL)
+		return -EOPNOTSUPP;
+
 	result = i801_check_pre(priv);
 	if (result < 0)
 		return result;
@@ -798,7 +821,8 @@ static int i801_block_transaction(struct i801_priv *priv,
 	 && command != I2C_SMBUS_I2C_BLOCK_DATA
 	 && i801_set_block_buffer_mode(priv) == 0)
 		result = i801_block_transaction_by_block(priv, data,
-							 read_write, hwpec);
+							 read_write,
+							 command, hwpec);
 	else
 		result = i801_block_transaction_byte_by_byte(priv, data,
 							     read_write,
@@ -890,6 +914,15 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
 			outb_p(command, SMBHSTCMD(priv));
 		block = 1;
 		break;
+	case I2C_SMBUS_BLOCK_PROC_CALL:
+		/*
+		 * Bit 0 of the slave address register always indicate a write
+		 * command.
+		 */
+		outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
+		outb_p(command, SMBHSTCMD(priv));
+		block = 1;
+		break;
 	default:
 		dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n",
 			size);
@@ -950,6 +983,8 @@ static u32 i801_func(struct i2c_adapter *adapter)
 	       I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 	       I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
 	       ((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) |
+	       ((priv->features & FEATURE_BLOCK_PROC) ?
+		I2C_FUNC_SMBUS_BLOCK_PROC_CALL : 0) |
 	       ((priv->features & FEATURE_I2C_BLOCK_READ) ?
 		I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0) |
 	       ((priv->features & FEATURE_HOST_NOTIFY) ?
@@ -1033,6 +1068,8 @@ static const struct pci_device_id i801_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ELKHART_LAKE_SMBUS) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_TIGERLAKE_LP_SMBUS) },
 	{ 0, }
 };
 
@@ -1134,6 +1171,118 @@ static void dmi_check_onboard_devices(const struct dmi_header *dm, void *adap)
 	}
 }
 
+/* NOTE: Keep this list in sync with drivers/platform/x86/dell-smo8800.c */
+static const char *const acpi_smo8800_ids[] = {
+	"SMO8800",
+	"SMO8801",
+	"SMO8810",
+	"SMO8811",
+	"SMO8820",
+	"SMO8821",
+	"SMO8830",
+	"SMO8831",
+};
+
+static acpi_status check_acpi_smo88xx_device(acpi_handle obj_handle,
+					     u32 nesting_level,
+					     void *context,
+					     void **return_value)
+{
+	struct acpi_device_info *info;
+	acpi_status status;
+	char *hid;
+	int i;
+
+	status = acpi_get_object_info(obj_handle, &info);
+	if (!ACPI_SUCCESS(status) || !(info->valid & ACPI_VALID_HID))
+		return AE_OK;
+
+	hid = info->hardware_id.string;
+	if (!hid)
+		return AE_OK;
+
+	i = match_string(acpi_smo8800_ids, ARRAY_SIZE(acpi_smo8800_ids), hid);
+	if (i < 0)
+		return AE_OK;
+
+	*((bool *)return_value) = true;
+	return AE_CTRL_TERMINATE;
+}
+
+static bool is_dell_system_with_lis3lv02d(void)
+{
+	bool found;
+	const char *vendor;
+
+	vendor = dmi_get_system_info(DMI_SYS_VENDOR);
+	if (!vendor || strcmp(vendor, "Dell Inc."))
+		return false;
+
+	/*
+	 * Check that ACPI device SMO88xx is present and is functioning.
+	 * Function acpi_get_devices() already filters all ACPI devices
+	 * which are not present or are not functioning.
+	 * ACPI device SMO88xx represents our ST microelectronics lis3lv02d
+	 * accelerometer but unfortunately ACPI does not provide any other
+	 * information (like I2C address).
+	 */
+	found = false;
+	acpi_get_devices(NULL, check_acpi_smo88xx_device, NULL,
+			 (void **)&found);
+
+	return found;
+}
+
+/*
+ * Accelerometer's I2C address is not specified in DMI nor ACPI,
+ * so it is needed to define mapping table based on DMI product names.
+ */
+static const struct {
+	const char *dmi_product_name;
+	unsigned short i2c_addr;
+} dell_lis3lv02d_devices[] = {
+	/*
+	 * Dell platform team told us that these Latitude devices have
+	 * ST microelectronics accelerometer at I2C address 0x29.
+	 */
+	{ "Latitude E5250",     0x29 },
+	{ "Latitude E5450",     0x29 },
+	{ "Latitude E5550",     0x29 },
+	{ "Latitude E6440",     0x29 },
+	{ "Latitude E6440 ATG", 0x29 },
+	{ "Latitude E6540",     0x29 },
+	/*
+	 * Additional individual entries were added after verification.
+	 */
+	{ "Vostro V131",        0x1d },
+};
+
+static void register_dell_lis3lv02d_i2c_device(struct i801_priv *priv)
+{
+	struct i2c_board_info info;
+	const char *dmi_product_name;
+	int i;
+
+	dmi_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
+	for (i = 0; i < ARRAY_SIZE(dell_lis3lv02d_devices); ++i) {
+		if (strcmp(dmi_product_name,
+			   dell_lis3lv02d_devices[i].dmi_product_name) == 0)
+			break;
+	}
+
+	if (i == ARRAY_SIZE(dell_lis3lv02d_devices)) {
+		dev_warn(&priv->pci_dev->dev,
+			 "Accelerometer lis3lv02d is present on SMBus but its"
+			 " address is unknown, skipping registration\n");
+		return;
+	}
+
+	memset(&info, 0, sizeof(struct i2c_board_info));
+	info.addr = dell_lis3lv02d_devices[i].i2c_addr;
+	strlcpy(info.type, "lis3lv02d", I2C_NAME_SIZE);
+	i2c_new_device(&priv->adapter, &info);
+}
+
 /* Register optional slaves */
 static void i801_probe_optional_slaves(struct i801_priv *priv)
 {
@@ -1152,6 +1301,9 @@ static void i801_probe_optional_slaves(struct i801_priv *priv)
 
 	if (dmi_name_in_vendors("FUJITSU"))
 		dmi_walk(dmi_check_onboard_devices, &priv->adapter);
+
+	if (is_dell_system_with_lis3lv02d())
+		register_dell_lis3lv02d_i2c_device(priv);
 }
 #else
 static void __init input_apanel_init(void) {}
@@ -1250,7 +1402,8 @@ static int i801_add_mux(struct i801_priv *priv)
 	struct device *dev = &priv->adapter.dev;
 	const struct i801_mux_config *mux_config;
 	struct i2c_mux_gpio_platform_data gpio_data;
-	int err;
+	struct gpiod_lookup_table *lookup;
+	int err, i;
 
 	if (!priv->mux_drvdata)
 		return 0;
@@ -1262,17 +1415,36 @@ static int i801_add_mux(struct i801_priv *priv)
 	gpio_data.values = mux_config->values;
 	gpio_data.n_values = mux_config->n_values;
 	gpio_data.classes = mux_config->classes;
-	gpio_data.gpio_chip = mux_config->gpio_chip;
-	gpio_data.gpios = mux_config->gpios;
-	gpio_data.n_gpios = mux_config->n_gpios;
 	gpio_data.idle = I2C_MUX_GPIO_NO_IDLE;
 
-	/* Register the mux device */
+	/* Register GPIO descriptor lookup table */
+	lookup = devm_kzalloc(dev,
+			      struct_size(lookup, table, mux_config->n_gpios),
+			      GFP_KERNEL);
+	if (!lookup)
+		return -ENOMEM;
+	lookup->dev_id = "i2c-mux-gpio";
+	for (i = 0; i < mux_config->n_gpios; i++) {
+		lookup->table[i].chip_label = mux_config->gpio_chip;
+		lookup->table[i].chip_hwnum = mux_config->gpios[i];
+		lookup->table[i].con_id = "mux";
+	}
+	gpiod_add_lookup_table(lookup);
+	priv->lookup = lookup;
+
+	/*
+	 * Register the mux device, we use PLATFORM_DEVID_NONE here
+	 * because since we are referring to the GPIO chip by name we are
+	 * anyways in deep trouble if there is more than one of these
+	 * devices, and there should likely only be one platform controller
+	 * hub.
+	 */
 	priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio",
-				PLATFORM_DEVID_AUTO, &gpio_data,
+				PLATFORM_DEVID_NONE, &gpio_data,
 				sizeof(struct i2c_mux_gpio_platform_data));
 	if (IS_ERR(priv->mux_pdev)) {
 		err = PTR_ERR(priv->mux_pdev);
+		gpiod_remove_lookup_table(lookup);
 		priv->mux_pdev = NULL;
 		dev_err(dev, "Failed to register i2c-mux-gpio device\n");
 		return err;
@@ -1285,6 +1457,8 @@ static void i801_del_mux(struct i801_priv *priv)
 {
 	if (priv->mux_pdev)
 		platform_device_unregister(priv->mux_pdev);
+	if (priv->lookup)
+		gpiod_remove_lookup_table(priv->lookup);
 }
 
 static unsigned int i801_get_adapter_class(struct i801_priv *priv)
@@ -1530,6 +1704,9 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	case PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS:
 	case PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS:
 	case PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS:
+	case PCI_DEVICE_ID_INTEL_ELKHART_LAKE_SMBUS:
+	case PCI_DEVICE_ID_INTEL_TIGERLAKE_LP_SMBUS:
+		priv->features |= FEATURE_BLOCK_PROC;
 		priv->features |= FEATURE_I2C_BLOCK_READ;
 		priv->features |= FEATURE_IRQ;
 		priv->features |= FEATURE_SMBUS_PEC;
@@ -1549,6 +1726,7 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
 		priv->features |= FEATURE_IDF;
 		/* fall through */
 	default:
+		priv->features |= FEATURE_BLOCK_PROC;
 		priv->features |= FEATURE_I2C_BLOCK_READ;
 		priv->features |= FEATURE_IRQ;
 		/* fall through */

drivers/i2c/busses/i2c-imx.c

@@ -1220,8 +1220,7 @@ static int i2c_imx_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int i2c_imx_runtime_suspend(struct device *dev)
+static int __maybe_unused i2c_imx_runtime_suspend(struct device *dev)
 {
 	struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
 
@@ -1230,7 +1229,7 @@ static int i2c_imx_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int i2c_imx_runtime_resume(struct device *dev)
+static int __maybe_unused i2c_imx_runtime_resume(struct device *dev)
 {
 	struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
 	int ret;
@@ -1246,17 +1245,13 @@ static const struct dev_pm_ops i2c_imx_pm_ops = {
 	SET_RUNTIME_PM_OPS(i2c_imx_runtime_suspend,
 			   i2c_imx_runtime_resume, NULL)
 };
-#define I2C_IMX_PM_OPS (&i2c_imx_pm_ops)
-#else
-#define I2C_IMX_PM_OPS NULL
-#endif /* CONFIG_PM */
 
 static struct platform_driver i2c_imx_driver = {
 	.probe = i2c_imx_probe,
 	.remove = i2c_imx_remove,
 	.driver = {
 		.name = DRIVER_NAME,
-		.pm = I2C_IMX_PM_OPS,
+		.pm = &i2c_imx_pm_ops,
 		.of_match_table = i2c_imx_dt_ids,
 	},
 	.id_table = imx_i2c_devtype,

drivers/i2c/busses/i2c-iop3xx.c

@@ -35,7 +35,7 @@
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
 #include <linux/io.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 
 #include "i2c-iop3xx.h"
 
@@ -68,17 +68,16 @@ iop3xx_i2c_enable(struct i2c_algo_iop3xx_data *iop3xx_adap)
 
 	/*
 	 * Every time unit enable is asserted, GPOD needs to be cleared
-	 * on IOP3XX to avoid data corruption on the bus.
+	 * on IOP3XX to avoid data corruption on the bus. We use the
+	 * gpiod_set_raw_value() to make sure the 0 hits the hardware
+	 * GPOD register. These descriptors are only passed along to
+	 * the device if this is necessary.
 	 */
-#if defined(CONFIG_ARCH_IOP32X) || defined(CONFIG_ARCH_IOP33X)
-	if (iop3xx_adap->id == 0) {
-		gpio_set_value(7, 0);
-		gpio_set_value(6, 0);
-	} else {
-		gpio_set_value(5, 0);
-		gpio_set_value(4, 0);
-	}
-#endif
+	if (iop3xx_adap->gpio_scl)
+		gpiod_set_raw_value(iop3xx_adap->gpio_scl, 0);
+	if (iop3xx_adap->gpio_sda)
+		gpiod_set_raw_value(iop3xx_adap->gpio_sda, 0);
+
 	/* NB SR bits not same position as CR IE bits :-( */
 	iop3xx_adap->SR_enabled =
 		IOP3XX_ISR_ALD | IOP3XX_ISR_BERRD |
@@ -431,6 +430,17 @@ iop3xx_i2c_probe(struct platform_device *pdev)
 		goto free_adapter;
 	}
 
+	adapter_data->gpio_scl = devm_gpiod_get_optional(&pdev->dev,
+							 "scl",
+							 GPIOD_ASIS);
+	if (IS_ERR(adapter_data->gpio_scl))
+		return PTR_ERR(adapter_data->gpio_scl);
+	adapter_data->gpio_sda = devm_gpiod_get_optional(&pdev->dev,
+							 "sda",
+							 GPIOD_ASIS);
+	if (IS_ERR(adapter_data->gpio_sda))
+		return PTR_ERR(adapter_data->gpio_sda);
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		ret = -ENODEV;

drivers/i2c/busses/i2c-iop3xx.h

@@ -92,6 +92,8 @@ struct i2c_algo_iop3xx_data {
 	spinlock_t lock;
 	u32 SR_enabled, SR_received;
 	int id;
+	struct gpio_desc *gpio_scl;
+	struct gpio_desc *gpio_sda;
 };
 
 #endif /* I2C_IOP3XX_H */

drivers/i2c/busses/i2c-mt7621.c

@@ -0,0 +1,356 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * drivers/i2c/busses/i2c-mt7621.c
+ *
+ * Copyright (C) 2013 Steven Liu <steven_liu@mediatek.com>
+ * Copyright (C) 2016 Michael Lee <igvtee@gmail.com>
+ * Copyright (C) 2018 Jan Breuer <jan.breuer@jaybee.cz>
+ *
+ * Improve driver for i2cdetect from i2c-tools to detect i2c devices on the bus.
+ * (C) 2014 Sittisak <sittisaks@hotmail.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/reset.h>
+
+#define REG_SM0CFG2_REG		0x28
+#define REG_SM0CTL0_REG		0x40
+#define REG_SM0CTL1_REG		0x44
+#define REG_SM0D0_REG		0x50
+#define REG_SM0D1_REG		0x54
+#define REG_PINTEN_REG		0x5c
+#define REG_PINTST_REG		0x60
+#define REG_PINTCL_REG		0x64
+
+/* REG_SM0CFG2_REG */
+#define SM0CFG2_IS_AUTOMODE	BIT(0)
+
+/* REG_SM0CTL0_REG */
+#define SM0CTL0_ODRAIN		BIT(31)
+#define SM0CTL0_CLK_DIV_MASK	(0x7ff << 16)
+#define SM0CTL0_CLK_DIV_MAX	0x7ff
+#define SM0CTL0_CS_STATUS       BIT(4)
+#define SM0CTL0_SCL_STATE       BIT(3)
+#define SM0CTL0_SDA_STATE       BIT(2)
+#define SM0CTL0_EN              BIT(1)
+#define SM0CTL0_SCL_STRETCH     BIT(0)
+
+/* REG_SM0CTL1_REG */
+#define SM0CTL1_ACK_MASK	(0xff << 16)
+#define SM0CTL1_PGLEN_MASK	(0x7 << 8)
+#define SM0CTL1_PGLEN(x)	((((x) - 1) << 8) & SM0CTL1_PGLEN_MASK)
+#define SM0CTL1_READ		(5 << 4)
+#define SM0CTL1_READ_LAST	(4 << 4)
+#define SM0CTL1_STOP		(3 << 4)
+#define SM0CTL1_WRITE		(2 << 4)
+#define SM0CTL1_START		(1 << 4)
+#define SM0CTL1_MODE_MASK	(0x7 << 4)
+#define SM0CTL1_TRI		BIT(0)
+
+/* timeout waiting for I2C devices to respond */
+#define TIMEOUT_MS		1000
+
+struct mtk_i2c {
+	void __iomem *base;
+	struct device *dev;
+	struct i2c_adapter adap;
+	u32 bus_freq;
+	u32 clk_div;
+	u32 flags;
+	struct clk *clk;
+};
+
+static int mtk_i2c_wait_idle(struct mtk_i2c *i2c)
+{
+	int ret;
+	u32 val;
+
+	ret = readl_relaxed_poll_timeout(i2c->base + REG_SM0CTL1_REG,
+					 val, !(val & SM0CTL1_TRI),
+					 10, TIMEOUT_MS * 1000);
+	if (ret)
+		dev_dbg(i2c->dev, "idle err(%d)\n", ret);
+
+	return ret;
+}
+
+static void mtk_i2c_reset(struct mtk_i2c *i2c)
+{
+	int ret;
+
+	ret = device_reset(i2c->adap.dev.parent);
+	if (ret)
+		dev_err(i2c->dev, "I2C reset failed!\n");
+
+	/*
+	 * Don't set SM0CTL0_ODRAIN as its bit meaning is inverted. To
+	 * configure open-drain mode, this bit needs to be cleared.
+	 */
+	iowrite32(((i2c->clk_div << 16) & SM0CTL0_CLK_DIV_MASK) | SM0CTL0_EN |
+		  SM0CTL0_SCL_STRETCH, i2c->base + REG_SM0CTL0_REG);
+	iowrite32(0, i2c->base + REG_SM0CFG2_REG);
+}
+
+static void mtk_i2c_dump_reg(struct mtk_i2c *i2c)
+{
+	dev_dbg(i2c->dev,
+		"SM0CFG2 %08x, SM0CTL0 %08x, SM0CTL1 %08x, SM0D0 %08x, SM0D1 %08x\n",
+		ioread32(i2c->base + REG_SM0CFG2_REG),
+		ioread32(i2c->base + REG_SM0CTL0_REG),
+		ioread32(i2c->base + REG_SM0CTL1_REG),
+		ioread32(i2c->base + REG_SM0D0_REG),
+		ioread32(i2c->base + REG_SM0D1_REG));
+}
+
+static int mtk_i2c_check_ack(struct mtk_i2c *i2c, u32 expected)
+{
+	u32 ack = readl_relaxed(i2c->base + REG_SM0CTL1_REG);
+	u32 ack_expected = (expected << 16) & SM0CTL1_ACK_MASK;
+
+	return ((ack & ack_expected) == ack_expected) ? 0 : -ENXIO;
+}
+
+static int mtk_i2c_master_start(struct mtk_i2c *i2c)
+{
+	iowrite32(SM0CTL1_START | SM0CTL1_TRI, i2c->base + REG_SM0CTL1_REG);
+	return mtk_i2c_wait_idle(i2c);
+}
+
+static int mtk_i2c_master_stop(struct mtk_i2c *i2c)
+{
+	iowrite32(SM0CTL1_STOP | SM0CTL1_TRI, i2c->base + REG_SM0CTL1_REG);
+	return mtk_i2c_wait_idle(i2c);
+}
+
+static int mtk_i2c_master_cmd(struct mtk_i2c *i2c, u32 cmd, int page_len)
+{
+	iowrite32(cmd | SM0CTL1_TRI | SM0CTL1_PGLEN(page_len),
+		  i2c->base + REG_SM0CTL1_REG);
+	return mtk_i2c_wait_idle(i2c);
+}
+
+static int mtk_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
+			       int num)
+{
+	struct mtk_i2c *i2c;
+	struct i2c_msg *pmsg;
+	u16 addr;
+	int i, j, ret, len, page_len;
+	u32 cmd;
+	u32 data[2];
+
+	i2c = i2c_get_adapdata(adap);
+
+	for (i = 0; i < num; i++) {
+		pmsg = &msgs[i];
+
+		/* wait hardware idle */
+		ret = mtk_i2c_wait_idle(i2c);
+		if (ret)
+			goto err_timeout;
+
+		/* start sequence */
+		ret = mtk_i2c_master_start(i2c);
+		if (ret)
+			goto err_timeout;
+
+		/* write address */
+		if (pmsg->flags & I2C_M_TEN) {
+			/* 10 bits address */
+			addr = 0xf0 | ((pmsg->addr >> 7) & 0x06);
+			addr |= (pmsg->addr & 0xff) << 8;
+			if (pmsg->flags & I2C_M_RD)
+				addr |= 1;
+			iowrite32(addr, i2c->base + REG_SM0D0_REG);
+			ret = mtk_i2c_master_cmd(i2c, SM0CTL1_WRITE, 2);
+			if (ret)
+				goto err_timeout;
+		} else {
+			/* 7 bits address */
+			addr = i2c_8bit_addr_from_msg(pmsg);
+			iowrite32(addr, i2c->base + REG_SM0D0_REG);
+			ret = mtk_i2c_master_cmd(i2c, SM0CTL1_WRITE, 1);
+			if (ret)
+				goto err_timeout;
+		}
+
+		/* check address ACK */
+		if (!(pmsg->flags & I2C_M_IGNORE_NAK)) {
+			ret = mtk_i2c_check_ack(i2c, BIT(0));
+			if (ret)
+				goto err_ack;
+		}
+
+		/* transfer data */
+		for (len = pmsg->len, j = 0; len > 0; len -= 8, j += 8) {
+			page_len = (len >= 8) ? 8 : len;
+
+			if (pmsg->flags & I2C_M_RD) {
+				cmd = (len > 8) ?
+					SM0CTL1_READ : SM0CTL1_READ_LAST;
+			} else {
+				memcpy(data, &pmsg->buf[j], page_len);
+				iowrite32(data[0], i2c->base + REG_SM0D0_REG);
+				iowrite32(data[1], i2c->base + REG_SM0D1_REG);
+				cmd = SM0CTL1_WRITE;
+			}
+
+			ret = mtk_i2c_master_cmd(i2c, cmd, page_len);
+			if (ret)
+				goto err_timeout;
+
+			if (pmsg->flags & I2C_M_RD) {
+				data[0] = ioread32(i2c->base + REG_SM0D0_REG);
+				data[1] = ioread32(i2c->base + REG_SM0D1_REG);
+				memcpy(&pmsg->buf[j], data, page_len);
+			} else {
+				if (!(pmsg->flags & I2C_M_IGNORE_NAK)) {
+					ret = mtk_i2c_check_ack(i2c,
+								(1 << page_len)
+								- 1);
+					if (ret)
+						goto err_ack;
+				}
+			}
+		}
+	}
+
+	ret = mtk_i2c_master_stop(i2c);
+	if (ret)
+		goto err_timeout;
+
+	/* the return value is number of executed messages */
+	return i;
+
+err_ack:
+	ret = mtk_i2c_master_stop(i2c);
+	if (ret)
+		goto err_timeout;
+	return -ENXIO;
+
+err_timeout:
+	mtk_i2c_dump_reg(i2c);
+	mtk_i2c_reset(i2c);
+	return ret;
+}
+
+static u32 mtk_i2c_func(struct i2c_adapter *a)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_PROTOCOL_MANGLING;
+}
+
+static const struct i2c_algorithm mtk_i2c_algo = {
+	.master_xfer	= mtk_i2c_master_xfer,
+	.functionality	= mtk_i2c_func,
+};
+
+static const struct of_device_id i2c_mtk_dt_ids[] = {
+	{ .compatible = "mediatek,mt7621-i2c" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, i2c_mtk_dt_ids);
+
+static void mtk_i2c_init(struct mtk_i2c *i2c)
+{
+	i2c->clk_div = clk_get_rate(i2c->clk) / i2c->bus_freq - 1;
+	if (i2c->clk_div < 99)
+		i2c->clk_div = 99;
+	if (i2c->clk_div > SM0CTL0_CLK_DIV_MAX)
+		i2c->clk_div = SM0CTL0_CLK_DIV_MAX;
+
+	mtk_i2c_reset(i2c);
+}
+
+static int mtk_i2c_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct mtk_i2c *i2c;
+	struct i2c_adapter *adap;
+	int ret;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	i2c = devm_kzalloc(&pdev->dev, sizeof(struct mtk_i2c), GFP_KERNEL);
+	if (!i2c)
+		return -ENOMEM;
+
+	i2c->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(i2c->base))
+		return PTR_ERR(i2c->base);
+
+	i2c->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(i2c->clk)) {
+		dev_err(&pdev->dev, "no clock defined\n");
+		return PTR_ERR(i2c->clk);
+	}
+	ret = clk_prepare_enable(i2c->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Unable to enable clock\n");
+		return ret;
+	}
+
+	i2c->dev = &pdev->dev;
+
+	if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
+				 &i2c->bus_freq))
+		i2c->bus_freq = 100000;
+
+	if (i2c->bus_freq == 0) {
+		dev_warn(i2c->dev, "clock-frequency 0 not supported\n");
+		return -EINVAL;
+	}
+
+	adap = &i2c->adap;
+	adap->owner = THIS_MODULE;
+	adap->algo = &mtk_i2c_algo;
+	adap->retries = 3;
+	adap->dev.parent = &pdev->dev;
+	i2c_set_adapdata(adap, i2c);
+	adap->dev.of_node = pdev->dev.of_node;
+	strlcpy(adap->name, dev_name(&pdev->dev), sizeof(adap->name));
+
+	platform_set_drvdata(pdev, i2c);
+
+	mtk_i2c_init(i2c);
+
+	ret = i2c_add_adapter(adap);
+	if (ret < 0)
+		return ret;
+
+	dev_info(&pdev->dev, "clock %u kHz\n", i2c->bus_freq / 1000);
+
+	return ret;
+}
+
+static int mtk_i2c_remove(struct platform_device *pdev)
+{
+	struct mtk_i2c *i2c = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(i2c->clk);
+	i2c_del_adapter(&i2c->adap);
+
+	return 0;
+}
+
+static struct platform_driver mtk_i2c_driver = {
+	.probe		= mtk_i2c_probe,
+	.remove		= mtk_i2c_remove,
+	.driver		= {
+		.name	= "i2c-mt7621",
+		.of_match_table = i2c_mtk_dt_ids,
+	},
+};
+
+module_platform_driver(mtk_i2c_driver);
+
+MODULE_AUTHOR("Steven Liu");
+MODULE_DESCRIPTION("MT7621 I2C host driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:MT7621-I2C");

drivers/i2c/busses/i2c-nvidia-gpu.c

@@ -51,6 +51,7 @@ struct gpu_i2c_dev {
 	void __iomem *regs;
 	struct i2c_adapter adapter;
 	struct i2c_board_info *gpu_ccgx_ucsi;
+	struct i2c_client *ccgx_client;
 };
 
 static void gpu_enable_i2c_bus(struct gpu_i2c_dev *i2cd)
@@ -169,12 +170,14 @@ static int gpu_i2c_master_xfer(struct i2c_adapter *adap,
 {
 	struct gpu_i2c_dev *i2cd = i2c_get_adapdata(adap);
 	int status, status2;
+	bool send_stop = true;
 	int i, j;
 
 	/*
 	 * The controller supports maximum 4 byte read due to known
 	 * limitation of sending STOP after every read.
 	 */
+	pm_runtime_get_sync(i2cd->dev);
 	for (i = 0; i < num; i++) {
 		if (msgs[i].flags & I2C_M_RD) {
 			/* program client address before starting read */
@@ -182,37 +185,42 @@ static int gpu_i2c_master_xfer(struct i2c_adapter *adap,
 			/* gpu_i2c_read has implicit start */
 			status = gpu_i2c_read(i2cd, msgs[i].buf, msgs[i].len);
 			if (status < 0)
-				goto stop;
+				goto exit;
 		} else {
 			u8 addr = i2c_8bit_addr_from_msg(msgs + i);
 
 			status = gpu_i2c_start(i2cd);
 			if (status < 0) {
 				if (i == 0)
-					return status;
-				goto stop;
+					send_stop = false;
+				goto exit;
 			}
 
 			status = gpu_i2c_write(i2cd, addr);
 			if (status < 0)
-				goto stop;
+				goto exit;
 
 			for (j = 0; j < msgs[i].len; j++) {
 				status = gpu_i2c_write(i2cd, msgs[i].buf[j]);
 				if (status < 0)
-					goto stop;
+					goto exit;
 			}
 		}
 	}
+	send_stop = false;
 	status = gpu_i2c_stop(i2cd);
 	if (status < 0)
-		return status;
+		goto exit;
 
-	return i;
-stop:
-	status2 = gpu_i2c_stop(i2cd);
-	if (status2 < 0)
-		dev_err(i2cd->dev, "i2c stop failed %d\n", status2);
+	status = i;
+exit:
+	if (send_stop) {
+		status2 = gpu_i2c_stop(i2cd);
+		if (status2 < 0)
+			dev_err(i2cd->dev, "i2c stop failed %d\n", status2);
+	}
+	pm_runtime_mark_last_busy(i2cd->dev);
+	pm_runtime_put_autosuspend(i2cd->dev);
 	return status;
 }
 
@@ -261,8 +269,6 @@ static const struct property_entry ccgx_props[] = {
 
 static int gpu_populate_client(struct gpu_i2c_dev *i2cd, int irq)
 {
-	struct i2c_client *ccgx_client;
-
 	i2cd->gpu_ccgx_ucsi = devm_kzalloc(i2cd->dev,
 					   sizeof(*i2cd->gpu_ccgx_ucsi),
 					   GFP_KERNEL);
@@ -274,8 +280,8 @@ static int gpu_populate_client(struct gpu_i2c_dev *i2cd, int irq)
 	i2cd->gpu_ccgx_ucsi->addr = 0x8;
 	i2cd->gpu_ccgx_ucsi->irq = irq;
 	i2cd->gpu_ccgx_ucsi->properties = ccgx_props;
-	ccgx_client = i2c_new_device(&i2cd->adapter, i2cd->gpu_ccgx_ucsi);
-	if (!ccgx_client)
+	i2cd->ccgx_client = i2c_new_device(&i2cd->adapter, i2cd->gpu_ccgx_ucsi);
+	if (!i2cd->ccgx_client)
 		return -ENODEV;
 
 	return 0;
@@ -332,6 +338,11 @@ static int gpu_i2c_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto del_adapter;
 	}
 
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 3000);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_put_autosuspend(&pdev->dev);
+	pm_runtime_allow(&pdev->dev);
+
 	return 0;
 
 del_adapter:
@@ -345,19 +356,38 @@ static void gpu_i2c_remove(struct pci_dev *pdev)
 {
 	struct gpu_i2c_dev *i2cd = dev_get_drvdata(&pdev->dev);
 
+	pm_runtime_get_noresume(i2cd->dev);
 	i2c_del_adapter(&i2cd->adapter);
 	pci_free_irq_vectors(pdev);
 }
 
+/*
+ * We need gpu_i2c_suspend() even if it is stub, for runtime pm to work
+ * correctly. Without it, lspci shows runtime pm status as "D0" for the card.
+ * Documentation/power/pci.txt also insists for driver to provide this.
+ */
+static __maybe_unused int gpu_i2c_suspend(struct device *dev)
+{
+	return 0;
+}
+
 static __maybe_unused int gpu_i2c_resume(struct device *dev)
 {
 	struct gpu_i2c_dev *i2cd = dev_get_drvdata(dev);
 
 	gpu_enable_i2c_bus(i2cd);
+	/*
+	 * Runtime resume ccgx client so that it can see for any
+	 * connector change event. Old ccg firmware has known
+	 * issue of not triggering interrupt when a device is
+	 * connected to runtime resume the controller.
+	 */
+	pm_request_resume(&i2cd->ccgx_client->dev);
 	return 0;
 }
 
-static UNIVERSAL_DEV_PM_OPS(gpu_i2c_driver_pm, NULL, gpu_i2c_resume, NULL);
+static UNIVERSAL_DEV_PM_OPS(gpu_i2c_driver_pm, gpu_i2c_suspend, gpu_i2c_resume,
+			    NULL);
 
 static struct pci_driver gpu_i2c_driver = {
 	.name		= "nvidia-gpu",

drivers/i2c/busses/i2c-ocores.c

@@ -35,6 +35,7 @@ struct ocores_i2c {
 	int iobase;
 	u32 reg_shift;
 	u32 reg_io_width;
+	unsigned long flags;
 	wait_queue_head_t wait;
 	struct i2c_adapter adap;
 	struct i2c_msg *msg;
@@ -82,6 +83,9 @@ struct ocores_i2c {
 
 #define TYPE_OCORES		0
 #define TYPE_GRLIB		1
+#define TYPE_SIFIVE_REV0	2
+
+#define OCORES_FLAG_BROKEN_IRQ BIT(1) /* Broken IRQ for FU540-C000 SoC */
 
 static void oc_setreg_8(struct ocores_i2c *i2c, int reg, u8 value)
 {
@@ -235,9 +239,12 @@ static irqreturn_t ocores_isr(int irq, void *dev_id)
 	struct ocores_i2c *i2c = dev_id;
 	u8 stat = oc_getreg(i2c, OCI2C_STATUS);
 
-	if (!(stat & OCI2C_STAT_IF))
+	if (i2c->flags & OCORES_FLAG_BROKEN_IRQ) {
+		if ((stat & OCI2C_STAT_IF) && !(stat & OCI2C_STAT_BUSY))
+			return IRQ_NONE;
+	} else if (!(stat & OCI2C_STAT_IF)) {
 		return IRQ_NONE;
-
+	}
 	ocores_process(i2c, stat);
 
 	return IRQ_HANDLED;
@@ -352,6 +359,11 @@ static void ocores_process_polling(struct ocores_i2c *i2c)
 		ret = ocores_isr(-1, i2c);
 		if (ret == IRQ_NONE)
 			break; /* all messages have been transferred */
+		else {
+			if (i2c->flags & OCORES_FLAG_BROKEN_IRQ)
+				if (i2c->state == STATE_DONE)
+					break;
+		}
 	}
 }
 
@@ -462,6 +474,14 @@ static const struct of_device_id ocores_i2c_match[] = {
 		.compatible = "aeroflexgaisler,i2cmst",
 		.data = (void *)TYPE_GRLIB,
 	},
+	{
+		.compatible = "sifive,fu540-c000-i2c",
+		.data = (void *)TYPE_SIFIVE_REV0,
+	},
+	{
+		.compatible = "sifive,i2c0",
+		.data = (void *)TYPE_SIFIVE_REV0,
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, ocores_i2c_match);
@@ -586,6 +606,7 @@ static int ocores_i2c_probe(struct platform_device *pdev)
 {
 	struct ocores_i2c *i2c;
 	struct ocores_i2c_platform_data *pdata;
+	const struct of_device_id *match;
 	struct resource *res;
 	int irq;
 	int ret;
@@ -668,6 +689,14 @@ static int ocores_i2c_probe(struct platform_device *pdev)
 	irq = platform_get_irq(pdev, 0);
 	if (irq == -ENXIO) {
 		ocores_algorithm.master_xfer = ocores_xfer_polling;
+
+		/*
+		 * Set in OCORES_FLAG_BROKEN_IRQ to enable workaround for
+		 * FU540-C000 SoC in polling mode.
+		 */
+		match = of_match_node(ocores_i2c_match, pdev->dev.of_node);
+		if (match && (long)match->data == TYPE_SIFIVE_REV0)
+			i2c->flags |= OCORES_FLAG_BROKEN_IRQ;
 	} else {
 		if (irq < 0)
 			return irq;

drivers/i2c/busses/i2c-qcom-geni.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
 
+#include <linux/acpi.h>
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/err.h>
@@ -483,6 +484,14 @@ static const struct i2c_algorithm geni_i2c_algo = {
 	.functionality	= geni_i2c_func,
 };
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id geni_i2c_acpi_match[] = {
+	{ "QCOM0220"},
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, geni_i2c_acpi_match);
+#endif
+
 static int geni_i2c_probe(struct platform_device *pdev)
 {
 	struct geni_i2c_dev *gi2c;
@@ -502,7 +511,7 @@ static int geni_i2c_probe(struct platform_device *pdev)
 		return PTR_ERR(gi2c->se.base);
 
 	gi2c->se.clk = devm_clk_get(&pdev->dev, "se");
-	if (IS_ERR(gi2c->se.clk)) {
+	if (IS_ERR(gi2c->se.clk) && !has_acpi_companion(&pdev->dev)) {
 		ret = PTR_ERR(gi2c->se.clk);
 		dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
 		return ret;
@@ -516,6 +525,9 @@ static int geni_i2c_probe(struct platform_device *pdev)
 		gi2c->clk_freq_out = KHZ(100);
 	}
 
+	if (has_acpi_companion(&pdev->dev))
+		ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(&pdev->dev));
+
 	gi2c->irq = platform_get_irq(pdev, 0);
 	if (gi2c->irq < 0) {
 		dev_err(&pdev->dev, "IRQ error for i2c-geni\n");
@@ -584,6 +596,8 @@ static int geni_i2c_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	dev_dbg(&pdev->dev, "Geni-I2C adaptor successfully added\n");
+
 	return 0;
 }
 
@@ -660,6 +674,7 @@ static struct platform_driver geni_i2c_driver = {
 		.name = "geni_i2c",
 		.pm = &geni_i2c_pm_ops,
 		.of_match_table = geni_i2c_dt_match,
+		.acpi_match_table = ACPI_PTR(geni_i2c_acpi_match),
 	},
 };
 

drivers/i2c/busses/i2c-s3c2410.c

@@ -24,7 +24,7 @@
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
@@ -113,7 +113,7 @@ struct s3c24xx_i2c {
 	struct i2c_adapter	adap;
 
 	struct s3c2410_platform_i2c	*pdata;
-	int			gpios[2];
+	struct gpio_desc	*gpios[2];
 	struct pinctrl          *pctrl;
 #if defined(CONFIG_ARM_S3C24XX_CPUFREQ)
 	struct notifier_block	freq_transition;
@@ -947,53 +947,27 @@ static inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c)
 #ifdef CONFIG_OF
 static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c)
 {
-	int idx, gpio, ret;
+	int i;
 
 	if (i2c->quirks & QUIRK_NO_GPIO)
 		return 0;
 
-	for (idx = 0; idx < 2; idx++) {
-		gpio = of_get_gpio(i2c->dev->of_node, idx);
-		if (!gpio_is_valid(gpio)) {
-			dev_err(i2c->dev, "invalid gpio[%d]: %d\n", idx, gpio);
-			goto free_gpio;
-		}
-		i2c->gpios[idx] = gpio;
-
-		ret = gpio_request(gpio, "i2c-bus");
-		if (ret) {
-			dev_err(i2c->dev, "gpio [%d] request failed (%d)\n",
-				gpio, ret);
-			goto free_gpio;
+	for (i = 0; i < 2; i++) {
+		i2c->gpios[i] = devm_gpiod_get_index(i2c->dev, NULL,
+						     i, GPIOD_ASIS);
+		if (IS_ERR(i2c->gpios[i])) {
+			dev_err(i2c->dev, "i2c gpio invalid at index %d\n", i);
+			return -EINVAL;
 		}
 	}
 	return 0;
-
-free_gpio:
-	while (--idx >= 0)
-		gpio_free(i2c->gpios[idx]);
-	return -EINVAL;
 }
 
-static void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c)
-{
-	unsigned int idx;
-
-	if (i2c->quirks & QUIRK_NO_GPIO)
-		return;
-
-	for (idx = 0; idx < 2; idx++)
-		gpio_free(i2c->gpios[idx]);
-}
 #else
 static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c)
 {
 	return 0;
 }
-
-static void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c)
-{
-}
 #endif
 
 /*
@@ -1222,9 +1196,6 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
 
 	i2c_del_adapter(&i2c->adap);
 
-	if (pdev->dev.of_node && IS_ERR(i2c->pctrl))
-		s3c24xx_i2c_dt_gpio_free(i2c);
-
 	return 0;
 }
 

drivers/i2c/busses/i2c-stm32f7.c

@@ -25,7 +25,6 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
-#include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pinctrl/consumer.h>
@@ -953,6 +952,9 @@ static int stm32f7_i2c_smbus_xfer_msg(struct stm32f7_i2c_dev *i2c_dev,
 		cr2 &= ~STM32F7_I2C_CR2_RD_WRN;
 		f7_msg->read_write = I2C_SMBUS_READ;
 		break;
+	case I2C_SMBUS_I2C_BLOCK_DATA:
+		/* Rely on emulated i2c transfer (through master_xfer) */
+		return -EOPNOTSUPP;
 	default:
 		dev_err(dev, "Unsupported smbus protocol %d\n", f7_msg->size);
 		return -EOPNOTSUPP;
@@ -1803,7 +1805,8 @@ static u32 stm32f7_i2c_func(struct i2c_adapter *adap)
 		I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 		I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 		I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
-		I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_PEC;
+		I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_PEC |
+		I2C_FUNC_SMBUS_I2C_BLOCK;
 }
 
 static struct i2c_algorithm stm32f7_i2c_algo = {
@@ -1816,15 +1819,14 @@ static struct i2c_algorithm stm32f7_i2c_algo = {
 
 static int stm32f7_i2c_probe(struct platform_device *pdev)
 {
-	struct device_node *np = pdev->dev.of_node;
 	struct stm32f7_i2c_dev *i2c_dev;
 	const struct stm32f7_i2c_setup *setup;
 	struct resource *res;
-	u32 irq_error, irq_event, clk_rate, rise_time, fall_time;
+	u32 clk_rate, rise_time, fall_time;
 	struct i2c_adapter *adap;
 	struct reset_control *rst;
 	dma_addr_t phy_addr;
-	int ret;
+	int irq_error, irq_event, ret;
 
 	i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
 	if (!i2c_dev)
@@ -1836,16 +1838,20 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 		return PTR_ERR(i2c_dev->base);
 	phy_addr = (dma_addr_t)res->start;
 
-	irq_event = irq_of_parse_and_map(np, 0);
-	if (!irq_event) {
-		dev_err(&pdev->dev, "IRQ event missing or invalid\n");
-		return -EINVAL;
+	irq_event = platform_get_irq(pdev, 0);
+	if (irq_event <= 0) {
+		if (irq_event != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Failed to get IRQ event: %d\n",
+				irq_event);
+		return irq_event ? : -ENOENT;
 	}
 
-	irq_error = irq_of_parse_and_map(np, 1);
-	if (!irq_error) {
-		dev_err(&pdev->dev, "IRQ error missing or invalid\n");
-		return -EINVAL;
+	irq_error = platform_get_irq(pdev, 1);
+	if (irq_error <= 0) {
+		if (irq_error != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Failed to get IRQ error: %d\n",
+				irq_error);
+		return irq_error ? : -ENOENT;
 	}
 
 	i2c_dev->clk = devm_clk_get(&pdev->dev, NULL);

drivers/i2c/busses/i2c-tegra.c

@@ -54,20 +54,15 @@
 #define I2C_INT_STATUS				0x068
 #define I2C_INT_BUS_CLR_DONE			BIT(11)
 #define I2C_INT_PACKET_XFER_COMPLETE		BIT(7)
-#define I2C_INT_ALL_PACKETS_XFER_COMPLETE	BIT(6)
-#define I2C_INT_TX_FIFO_OVERFLOW		BIT(5)
-#define I2C_INT_RX_FIFO_UNDERFLOW		BIT(4)
 #define I2C_INT_NO_ACK				BIT(3)
 #define I2C_INT_ARBITRATION_LOST		BIT(2)
 #define I2C_INT_TX_FIFO_DATA_REQ		BIT(1)
 #define I2C_INT_RX_FIFO_DATA_REQ		BIT(0)
 #define I2C_CLK_DIVISOR				0x06c
 #define I2C_CLK_DIVISOR_STD_FAST_MODE_SHIFT	16
-#define I2C_CLK_MULTIPLIER_STD_FAST_MODE	8
 
 #define DVC_CTRL_REG1				0x000
 #define DVC_CTRL_REG1_INTR_EN			BIT(10)
-#define DVC_CTRL_REG2				0x004
 #define DVC_CTRL_REG3				0x008
 #define DVC_CTRL_REG3_SW_PROG			BIT(26)
 #define DVC_CTRL_REG3_I2C_DONE_INTR_EN		BIT(30)
@@ -75,24 +70,22 @@
 #define DVC_STATUS_I2C_DONE_INTR		BIT(30)
 
 #define I2C_ERR_NONE				0x00
-#define I2C_ERR_NO_ACK				0x01
-#define I2C_ERR_ARBITRATION_LOST		0x02
-#define I2C_ERR_UNKNOWN_INTERRUPT		0x04
+#define I2C_ERR_NO_ACK				BIT(0)
+#define I2C_ERR_ARBITRATION_LOST		BIT(1)
+#define I2C_ERR_UNKNOWN_INTERRUPT		BIT(2)
+#define I2C_ERR_RX_BUFFER_OVERFLOW		BIT(3)
 
 #define PACKET_HEADER0_HEADER_SIZE_SHIFT	28
 #define PACKET_HEADER0_PACKET_ID_SHIFT		16
 #define PACKET_HEADER0_CONT_ID_SHIFT		12
 #define PACKET_HEADER0_PROTOCOL_I2C		BIT(4)
 
-#define I2C_HEADER_HIGHSPEED_MODE		BIT(22)
 #define I2C_HEADER_CONT_ON_NAK			BIT(21)
-#define I2C_HEADER_SEND_START_BYTE		BIT(20)
 #define I2C_HEADER_READ				BIT(19)
 #define I2C_HEADER_10BIT_ADDR			BIT(18)
 #define I2C_HEADER_IE_ENABLE			BIT(17)
 #define I2C_HEADER_REPEAT_START			BIT(16)
 #define I2C_HEADER_CONTINUE_XFER		BIT(15)
-#define I2C_HEADER_MASTER_ADDR_SHIFT		12
 #define I2C_HEADER_SLAVE_ADDR_SHIFT		1
 
 #define I2C_BUS_CLEAR_CNFG			0x084
@@ -106,8 +99,6 @@
 
 #define I2C_CONFIG_LOAD				0x08C
 #define I2C_MSTR_CONFIG_LOAD			BIT(0)
-#define I2C_SLV_CONFIG_LOAD			BIT(1)
-#define I2C_TIMEOUT_CONFIG_LOAD			BIT(2)
 
 #define I2C_CLKEN_OVERRIDE			0x090
 #define I2C_MST_CORE_CLKEN_OVR			BIT(0)
@@ -133,7 +124,6 @@
 #define I2C_STANDARD_MODE			100000
 #define I2C_FAST_MODE				400000
 #define I2C_FAST_PLUS_MODE			1000000
-#define I2C_HS_MODE				3500000
 
 /* Packet header size in bytes */
 #define I2C_PACKET_HEADER_SIZE			12
@@ -280,6 +270,7 @@ struct tegra_i2c_dev {
 	u32 bus_clk_rate;
 	u16 clk_divisor_non_hs_mode;
 	bool is_multimaster_mode;
+	/* xfer_lock: lock to serialize transfer submission and processing */
 	spinlock_t xfer_lock;
 	struct dma_chan *tx_dma_chan;
 	struct dma_chan *rx_dma_chan;
@@ -306,7 +297,7 @@ static u32 dvc_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg)
  * to the I2C block inside the DVC block
  */
 static unsigned long tegra_i2c_reg_addr(struct tegra_i2c_dev *i2c_dev,
-	unsigned long reg)
+					unsigned long reg)
 {
 	if (i2c_dev->is_dvc)
 		reg += (reg >= I2C_TX_FIFO) ? 0x10 : 0x40;
@@ -314,7 +305,7 @@ static unsigned long tegra_i2c_reg_addr(struct tegra_i2c_dev *i2c_dev,
 }
 
 static void i2c_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
-	unsigned long reg)
+		       unsigned long reg)
 {
 	writel(val, i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg));
 
@@ -329,13 +320,13 @@ static u32 i2c_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg)
 }
 
 static void i2c_writesl(struct tegra_i2c_dev *i2c_dev, void *data,
-	unsigned long reg, int len)
+			unsigned long reg, int len)
 {
 	writesl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg), data, len);
 }
 
 static void i2c_readsl(struct tegra_i2c_dev *i2c_dev, void *data,
-	unsigned long reg, int len)
+		       unsigned long reg, int len)
 {
 	readsl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg), data, len);
 }
@@ -486,7 +477,7 @@ static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
 			dev_warn(i2c_dev->dev, "timeout waiting for fifo flush\n");
 			return -ETIMEDOUT;
 		}
-		msleep(1);
+		usleep_range(1000, 2000);
 	}
 	return 0;
 }
@@ -499,6 +490,13 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
 	size_t buf_remaining = i2c_dev->msg_buf_remaining;
 	int words_to_transfer;
 
+	/*
+	 * Catch overflow due to message fully sent
+	 * before the check for RX FIFO availability.
+	 */
+	if (WARN_ON_ONCE(!(i2c_dev->msg_buf_remaining)))
+		return -EINVAL;
+
 	if (i2c_dev->hw->has_mst_fifo) {
 		val = i2c_readl(i2c_dev, I2C_MST_FIFO_STATUS);
 		rx_fifo_avail = (val & I2C_MST_FIFO_STATUS_RX_MASK) >>
@@ -525,7 +523,11 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
 	 * prevent overwriting past the end of buf
 	 */
 	if (rx_fifo_avail > 0 && buf_remaining > 0) {
-		BUG_ON(buf_remaining > 3);
+		/*
+		 * buf_remaining > 3 check not needed as rx_fifo_avail == 0
+		 * when (words_to_transfer was > rx_fifo_avail) earlier
+		 * in this function.
+		 */
 		val = i2c_readl(i2c_dev, I2C_RX_FIFO);
 		val = cpu_to_le32(val);
 		memcpy(buf, &val, buf_remaining);
@@ -533,7 +535,10 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
 		rx_fifo_avail--;
 	}
 
-	BUG_ON(rx_fifo_avail > 0 && buf_remaining > 0);
+	/* RX FIFO must be drained, otherwise it's an Overflow case. */
+	if (WARN_ON_ONCE(rx_fifo_avail))
+		return -EINVAL;
+
 	i2c_dev->msg_buf_remaining = buf_remaining;
 	i2c_dev->msg_buf = buf;
 
@@ -591,7 +596,11 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
 	 * boundary and fault.
 	 */
 	if (tx_fifo_avail > 0 && buf_remaining > 0) {
-		BUG_ON(buf_remaining > 3);
+		/*
+		 * buf_remaining > 3 check not needed as tx_fifo_avail == 0
+		 * when (words_to_transfer was > tx_fifo_avail) earlier
+		 * in this function for non-zero words_to_transfer.
+		 */
 		memcpy(&val, buf, buf_remaining);
 		val = le32_to_cpu(val);
 
@@ -680,10 +689,11 @@ static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev)
 		i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD);
 		if (in_interrupt())
 			err = readl_poll_timeout_atomic(addr, val, val == 0,
-					1000, I2C_CONFIG_LOAD_TIMEOUT);
+							1000,
+							I2C_CONFIG_LOAD_TIMEOUT);
 		else
-			err = readl_poll_timeout(addr, val, val == 0,
-					1000, I2C_CONFIG_LOAD_TIMEOUT);
+			err = readl_poll_timeout(addr, val, val == 0, 1000,
+						 I2C_CONFIG_LOAD_TIMEOUT);
 
 		if (err) {
 			dev_warn(i2c_dev->dev,
@@ -700,7 +710,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit)
 	u32 val;
 	int err;
 	u32 clk_divisor, clk_multiplier;
-	u32 tsu_thd = 0;
+	u32 tsu_thd;
 	u8 tlow, thigh;
 
 	err = pm_runtime_get_sync(i2c_dev->dev);
@@ -856,10 +866,15 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
 
 	if (!i2c_dev->is_curr_dma_xfer) {
 		if (i2c_dev->msg_read && (status & I2C_INT_RX_FIFO_DATA_REQ)) {
-			if (i2c_dev->msg_buf_remaining)
-				tegra_i2c_empty_rx_fifo(i2c_dev);
-			else
-				BUG();
+			if (tegra_i2c_empty_rx_fifo(i2c_dev)) {
+				/*
+				 * Overflow error condition: message fully sent,
+				 * with no XFER_COMPLETE interrupt but hardware
+				 * asks to transfer more.
+				 */
+				i2c_dev->msg_err |= I2C_ERR_RX_BUFFER_OVERFLOW;
+				goto err;
+			}
 		}
 
 		if (!i2c_dev->msg_read && (status & I2C_INT_TX_FIFO_DATA_REQ)) {
@@ -885,7 +900,14 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
 	if (status & I2C_INT_PACKET_XFER_COMPLETE) {
 		if (i2c_dev->is_curr_dma_xfer)
 			i2c_dev->msg_buf_remaining = 0;
-		BUG_ON(i2c_dev->msg_buf_remaining);
+		/*
+		 * Underflow error condition: XFER_COMPLETE before message
+		 * fully sent.
+		 */
+		if (WARN_ON_ONCE(i2c_dev->msg_buf_remaining)) {
+			i2c_dev->msg_err |= I2C_ERR_UNKNOWN_INTERRUPT;
+			goto err;
+		}
 		complete(&i2c_dev->msg_complete);
 	}
 	goto done;
@@ -1024,7 +1046,8 @@ static int tegra_i2c_issue_bus_clear(struct i2c_adapter *adap)
 }
 
 static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
-	struct i2c_msg *msg, enum msg_end_type end_state)
+			      struct i2c_msg *msg,
+			      enum msg_end_type end_state)
 {
 	u32 packet_header;
 	u32 int_mask;
@@ -1161,9 +1184,8 @@ unlock:
 		if (err)
 			return err;
 
-		time_left = wait_for_completion_timeout(
-						&i2c_dev->dma_complete,
-						msecs_to_jiffies(xfer_time));
+		time_left = wait_for_completion_timeout(&i2c_dev->dma_complete,
+							msecs_to_jiffies(xfer_time));
 		if (time_left == 0) {
 			dev_err(i2c_dev->dev, "DMA transfer timeout\n");
 			dmaengine_terminate_sync(i2c_dev->msg_read ?
@@ -1225,11 +1247,11 @@ unlock:
 }
 
 static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
-	int num)
+			  int num)
 {
 	struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
 	int i;
-	int ret = 0;
+	int ret;
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
 	if (ret < 0) {
@@ -1271,14 +1293,15 @@ static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev)
 {
 	struct device_node *np = i2c_dev->dev->of_node;
 	int ret;
+	bool multi_mode;
 
 	ret = of_property_read_u32(np, "clock-frequency",
-			&i2c_dev->bus_clk_rate);
+				   &i2c_dev->bus_clk_rate);
 	if (ret)
 		i2c_dev->bus_clk_rate = 100000; /* default clock rate */
 
-	i2c_dev->is_multimaster_mode = of_property_read_bool(np,
-			"multi-master");
+	multi_mode = of_property_read_bool(np, "multi-master");
+	i2c_dev->is_multimaster_mode = multi_mode;
 }
 
 static const struct i2c_algorithm tegra_i2c_algo = {
@@ -1500,7 +1523,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	void __iomem *base;
 	phys_addr_t base_phys;
 	int irq;
-	int ret = 0;
+	int ret;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base_phys = res->start;
@@ -1517,7 +1540,9 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 
 	div_clk = devm_clk_get(&pdev->dev, "div-clk");
 	if (IS_ERR(div_clk)) {
-		dev_err(&pdev->dev, "missing controller clock\n");
+		if (PTR_ERR(div_clk) != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "missing controller clock\n");
+
 		return PTR_ERR(div_clk);
 	}
 
@@ -1622,7 +1647,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	}
 
 	ret = devm_request_irq(&pdev->dev, i2c_dev->irq,
-			tegra_i2c_isr, 0, dev_name(&pdev->dev), i2c_dev);
+			       tegra_i2c_isr, 0, dev_name(&pdev->dev), i2c_dev);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to request irq %i\n", i2c_dev->irq);
 		goto release_dma;
@@ -1687,10 +1712,35 @@ static int tegra_i2c_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM_SLEEP
+static int tegra_i2c_suspend(struct device *dev)
+{
+	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
+
+	i2c_mark_adapter_suspended(&i2c_dev->adapter);
+
+	return 0;
+}
+
+static int tegra_i2c_resume(struct device *dev)
+{
+	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
+	int err;
+
+	err = tegra_i2c_init(i2c_dev, false);
+	if (err)
+		return err;
+
+	i2c_mark_adapter_resumed(&i2c_dev->adapter);
+
+	return 0;
+}
+
 static const struct dev_pm_ops tegra_i2c_pm = {
+	SET_SYSTEM_SLEEP_PM_OPS(tegra_i2c_suspend, tegra_i2c_resume)
 	SET_RUNTIME_PM_OPS(tegra_i2c_runtime_suspend, tegra_i2c_runtime_resume,
 			   NULL)
 };
+
 #define TEGRA_I2C_PM	(&tegra_i2c_pm)
 #else
 #define TEGRA_I2C_PM	NULL

drivers/i2c/i2c-core-acpi.c

@@ -132,13 +132,52 @@ static int i2c_acpi_do_lookup(struct acpi_device *adev,
 	return 0;
 }
 
+static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
+{
+	int *irq = data;
+	struct resource r;
+
+	if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r))
+		*irq = i2c_dev_irq_from_resources(&r, 1);
+
+	return 1; /* No need to add resource to the list */
+}
+
+/**
+ * i2c_acpi_get_irq - get device IRQ number from ACPI
+ * @client: Pointer to the I2C client device
+ *
+ * Find the IRQ number used by a specific client device.
+ *
+ * Return: The IRQ number or an error code.
+ */
+int i2c_acpi_get_irq(struct i2c_client *client)
+{
+	struct acpi_device *adev = ACPI_COMPANION(&client->dev);
+	struct list_head resource_list;
+	int irq = -ENOENT;
+	int ret;
+
+	INIT_LIST_HEAD(&resource_list);
+
+	ret = acpi_dev_get_resources(adev, &resource_list,
+				     i2c_acpi_add_resource, &irq);
+	if (ret < 0)
+		return ret;
+
+	acpi_dev_free_resource_list(&resource_list);
+
+	if (irq == -ENOENT)
+		irq = acpi_dev_gpio_irq_get(adev, 0);
+
+	return irq;
+}
+
 static int i2c_acpi_get_info(struct acpi_device *adev,
 			     struct i2c_board_info *info,
 			     struct i2c_adapter *adapter,
 			     acpi_handle *adapter_handle)
 {
-	struct list_head resource_list;
-	struct resource_entry *entry;
 	struct i2c_acpi_lookup lookup;
 	int ret;
 
@@ -172,21 +211,6 @@ static int i2c_acpi_get_info(struct acpi_device *adev,
 	if (adapter_handle)
 		*adapter_handle = lookup.adapter_handle;
 
-	/* Then fill IRQ number if any */
-	INIT_LIST_HEAD(&resource_list);
-	ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
-	if (ret < 0)
-		return -EINVAL;
-
-	resource_list_for_each_entry(entry, &resource_list) {
-		if (resource_type(entry->res) == IORESOURCE_IRQ) {
-			info->irq = entry->res->start;
-			break;
-		}
-	}
-
-	acpi_dev_free_resource_list(&resource_list);
-
 	acpi_set_modalias(adev, dev_name(&adev->dev), info->type,
 			  sizeof(info->type));
 

drivers/i2c/i2c-core-base.c

@@ -314,6 +314,8 @@ static int i2c_device_probe(struct device *dev)
 
 	driver = to_i2c_driver(dev->driver);
 
+	client->irq = client->init_irq;
+
 	if (!client->irq && !driver->disable_i2c_core_irq_mapping) {
 		int irq = -ENOENT;
 
@@ -327,7 +329,7 @@ static int i2c_device_probe(struct device *dev)
 			if (irq == -EINVAL || irq == -ENODATA)
 				irq = of_irq_get(dev->of_node, 0);
 		} else if (ACPI_COMPANION(dev)) {
-			irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
+			irq = i2c_acpi_get_irq(client);
 		}
 		if (irq == -EPROBE_DEFER)
 			return irq;
@@ -424,7 +426,7 @@ static int i2c_device_remove(struct device *dev)
 	dev_pm_clear_wake_irq(&client->dev);
 	device_init_wakeup(&client->dev, false);
 
-	client->irq = client->init_irq;
+	client->irq = 0;
 	if (client->flags & I2C_CLIENT_HOST_NOTIFY)
 		pm_runtime_put(&client->adapter->dev);
 
@@ -679,8 +681,8 @@ static void i2c_dev_set_name(struct i2c_adapter *adap,
 		     i2c_encode_flags_to_addr(client));
 }
 
-static int i2c_dev_irq_from_resources(const struct resource *resources,
-				      unsigned int num_resources)
+int i2c_dev_irq_from_resources(const struct resource *resources,
+			       unsigned int num_resources)
 {
 	struct irq_data *irqd;
 	int i;
@@ -721,7 +723,7 @@ static int i2c_dev_irq_from_resources(const struct resource *resources,
  * This returns the new i2c client, which may be saved for later use with
  * i2c_unregister_device(); or an ERR_PTR to describe the error.
  */
-static struct i2c_client *
+struct i2c_client *
 i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
 {
 	struct i2c_client	*client;
@@ -741,7 +743,6 @@ i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *inf
 	if (!client->init_irq)
 		client->init_irq = i2c_dev_irq_from_resources(info->resources,
 							 info->num_resources);
-	client->irq = client->init_irq;
 
 	strlcpy(client->name, info->type, sizeof(client->name));
 
@@ -887,8 +888,7 @@ static struct i2c_driver dummy_driver = {
  * This returns the new i2c client, which should be saved for later use with
  * i2c_unregister_device(); or an ERR_PTR to describe the error.
  */
-static struct i2c_client *
-i2c_new_dummy_device(struct i2c_adapter *adapter, u16 address)
+struct i2c_client *i2c_new_dummy_device(struct i2c_adapter *adapter, u16 address)
 {
 	struct i2c_board_info info = {
 		I2C_BOARD_INFO("dummy", address),
@@ -1663,7 +1663,7 @@ EXPORT_SYMBOL_GPL(i2c_parse_fw_timings);
 
 /* ------------------------------------------------------------------------- */
 
-int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *))
+int i2c_for_each_dev(void *data, int (*fn)(struct device *dev, void *data))
 {
 	int res;
 
@@ -2276,7 +2276,7 @@ struct i2c_client *
 i2c_new_probed_device(struct i2c_adapter *adap,
 		      struct i2c_board_info *info,
 		      unsigned short const *addr_list,
-		      int (*probe)(struct i2c_adapter *, unsigned short addr))
+		      int (*probe)(struct i2c_adapter *adap, unsigned short addr))
 {
 	int i;
 

drivers/i2c/i2c-core-of.c

@@ -15,6 +15,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/sysfs.h>
 
 #include "i2c-core.h"
 

drivers/i2c/i2c-core.h

@@ -19,6 +19,8 @@ extern struct list_head	__i2c_board_list;
 extern int		__i2c_first_dynamic_bus_num;
 
 int i2c_check_7bit_addr_validity_strict(unsigned short addr);
+int i2c_dev_irq_from_resources(const struct resource *resources,
+			       unsigned int num_resources);
 
 /*
  * We only allow atomic transfers for very late communication, e.g. to send
@@ -61,6 +63,8 @@ const struct acpi_device_id *
 i2c_acpi_match_device(const struct acpi_device_id *matches,
 		      struct i2c_client *client);
 void i2c_acpi_register_devices(struct i2c_adapter *adap);
+
+int i2c_acpi_get_irq(struct i2c_client *client);
 #else /* CONFIG_ACPI */
 static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
 static inline const struct acpi_device_id *
@@ -69,6 +73,11 @@ i2c_acpi_match_device(const struct acpi_device_id *matches,
 {
 	return NULL;
 }
+
+static inline int i2c_acpi_get_irq(struct i2c_client *client)
+{
+	return 0;
+}
 #endif /* CONFIG_ACPI */
 extern struct notifier_block i2c_acpi_notifier;
 

drivers/i2c/i2c-mux.c

@@ -26,6 +26,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 
 /* multiplexer per channel data */
 struct i2c_mux_priv {
@@ -243,8 +244,7 @@ struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent,
 {
 	struct i2c_mux_core *muxc;
 
-	muxc = devm_kzalloc(dev, sizeof(*muxc)
-			    + max_adapters * sizeof(muxc->adapter[0])
+	muxc = devm_kzalloc(dev, struct_size(muxc, adapter, max_adapters)
 			    + sizeof_priv, GFP_KERNEL);
 	if (!muxc)
 		return NULL;

drivers/i2c/muxes/i2c-arb-gpio-challenge.c

@@ -6,12 +6,11 @@
  */
 
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/kernel.h>
 #include <linux/i2c.h>
 #include <linux/i2c-mux.h>
 #include <linux/module.h>
-#include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 
@@ -19,22 +18,16 @@
 /**
  * struct i2c_arbitrator_data - Driver data for I2C arbitrator
  *
- * @our_gpio: GPIO we'll use to claim.
- * @our_gpio_release: 0 if active high; 1 if active low; AKA if the GPIO ==
- *   this then consider it released.
- * @their_gpio: GPIO that the other side will use to claim.
- * @their_gpio_release: 0 if active high; 1 if active low; AKA if the GPIO ==
- *   this then consider it released.
+ * @our_gpio: GPIO descriptor we'll use to claim.
+ * @their_gpio: GPIO descriptor that the other side will use to claim.
  * @slew_delay_us: microseconds to wait for a GPIO to go high.
  * @wait_retry_us: we'll attempt another claim after this many microseconds.
  * @wait_free_us: we'll give up after this many microseconds.
  */
 
 struct i2c_arbitrator_data {
-	int our_gpio;
-	int our_gpio_release;
-	int their_gpio;
-	int their_gpio_release;
+	struct gpio_desc *our_gpio;
+	struct gpio_desc *their_gpio;
 	unsigned int slew_delay_us;
 	unsigned int wait_retry_us;
 	unsigned int wait_free_us;
@@ -55,15 +48,15 @@ static int i2c_arbitrator_select(struct i2c_mux_core *muxc, u32 chan)
 	stop_time = jiffies + usecs_to_jiffies(arb->wait_free_us) + 1;
 	do {
 		/* Indicate that we want to claim the bus */
-		gpio_set_value(arb->our_gpio, !arb->our_gpio_release);
+		gpiod_set_value(arb->our_gpio, 1);
 		udelay(arb->slew_delay_us);
 
 		/* Wait for the other master to release it */
 		stop_retry = jiffies + usecs_to_jiffies(arb->wait_retry_us) + 1;
 		while (time_before(jiffies, stop_retry)) {
-			int gpio_val = !!gpio_get_value(arb->their_gpio);
+			int gpio_val = gpiod_get_value(arb->their_gpio);
 
-			if (gpio_val == arb->their_gpio_release) {
+			if (!gpio_val) {
 				/* We got it, so return */
 				return 0;
 			}
@@ -72,13 +65,13 @@ static int i2c_arbitrator_select(struct i2c_mux_core *muxc, u32 chan)
 		}
 
 		/* It didn't release, so give up, wait, and try again */
-		gpio_set_value(arb->our_gpio, arb->our_gpio_release);
+		gpiod_set_value(arb->our_gpio, 0);
 
 		usleep_range(arb->wait_retry_us, arb->wait_retry_us * 2);
 	} while (time_before(jiffies, stop_time));
 
 	/* Give up, release our claim */
-	gpio_set_value(arb->our_gpio, arb->our_gpio_release);
+	gpiod_set_value(arb->our_gpio, 0);
 	udelay(arb->slew_delay_us);
 	dev_err(muxc->dev, "Could not claim bus, timeout\n");
 	return -EBUSY;
@@ -94,7 +87,7 @@ static int i2c_arbitrator_deselect(struct i2c_mux_core *muxc, u32 chan)
 	const struct i2c_arbitrator_data *arb = i2c_mux_priv(muxc);
 
 	/* Release the bus and wait for the other master to notice */
-	gpio_set_value(arb->our_gpio, arb->our_gpio_release);
+	gpiod_set_value(arb->our_gpio, 0);
 	udelay(arb->slew_delay_us);
 
 	return 0;
@@ -107,8 +100,7 @@ static int i2c_arbitrator_probe(struct platform_device *pdev)
 	struct device_node *parent_np;
 	struct i2c_mux_core *muxc;
 	struct i2c_arbitrator_data *arb;
-	enum of_gpio_flags gpio_flags;
-	unsigned long out_init;
+	struct gpio_desc *dummy;
 	int ret;
 
 	/* We only support probing from device tree; no platform_data */
@@ -129,45 +121,28 @@ static int i2c_arbitrator_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, muxc);
 
-	/* Request GPIOs */
-	ret = of_get_named_gpio_flags(np, "our-claim-gpio", 0, &gpio_flags);
-	if (!gpio_is_valid(ret)) {
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "Error getting our-claim-gpio\n");
-		return ret;
-	}
-	arb->our_gpio = ret;
-	arb->our_gpio_release = !!(gpio_flags & OF_GPIO_ACTIVE_LOW);
-	out_init = (gpio_flags & OF_GPIO_ACTIVE_LOW) ?
-		GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
-	ret = devm_gpio_request_one(dev, arb->our_gpio, out_init,
-				    "our-claim-gpio");
-	if (ret) {
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "Error requesting our-claim-gpio\n");
-		return ret;
+	/* Request GPIOs, our GPIO as unclaimed to begin with */
+	arb->our_gpio = devm_gpiod_get(dev, "our-claim", GPIOD_OUT_LOW);
+	if (IS_ERR(arb->our_gpio)) {
+		dev_err(dev, "could not get \"our-claim\" GPIO (%ld)\n",
+			PTR_ERR(arb->our_gpio));
+		return PTR_ERR(arb->our_gpio);
 	}
 
-	ret = of_get_named_gpio_flags(np, "their-claim-gpios", 0, &gpio_flags);
-	if (!gpio_is_valid(ret)) {
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "Error getting their-claim-gpio\n");
-		return ret;
-	}
-	arb->their_gpio = ret;
-	arb->their_gpio_release = !!(gpio_flags & OF_GPIO_ACTIVE_LOW);
-	ret = devm_gpio_request_one(dev, arb->their_gpio, GPIOF_IN,
-				    "their-claim-gpio");
-	if (ret) {
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "Error requesting their-claim-gpio\n");
-		return ret;
+	arb->their_gpio = devm_gpiod_get(dev, "their-claim", GPIOD_IN);
+	if (IS_ERR(arb->their_gpio)) {
+		dev_err(dev, "could not get \"their-claim\" GPIO (%ld)\n",
+			PTR_ERR(arb->their_gpio));
+		return PTR_ERR(arb->their_gpio);
 	}
 
 	/* At the moment we only support a single two master (us + 1 other) */
-	if (gpio_is_valid(of_get_named_gpio(np, "their-claim-gpios", 1))) {
+	dummy = devm_gpiod_get_index(dev, "their-claim", 1, GPIOD_IN);
+	if (!IS_ERR(dummy)) {
 		dev_err(dev, "Only one other master is supported\n");
 		return -EINVAL;
+	} else if (PTR_ERR(dummy) == -EPROBE_DEFER) {
+		return -EPROBE_DEFER;
 	}
 
 	/* Arbitration parameters */

drivers/i2c/muxes/i2c-mux-gpio.c

@@ -11,13 +11,14 @@
 #include <linux/platform_device.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-#include <linux/gpio.h>
+#include <linux/bits.h>
+#include <linux/gpio/consumer.h>
+/* FIXME: stop poking around inside gpiolib */
 #include "../../gpio/gpiolib.h"
-#include <linux/of_gpio.h>
 
 struct gpiomux {
 	struct i2c_mux_gpio_platform_data data;
-	unsigned gpio_base;
+	int ngpios;
 	struct gpio_desc **gpios;
 };
 
@@ -27,8 +28,7 @@ static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
 
 	values[0] = val;
 
-	gpiod_set_array_value_cansleep(mux->data.n_gpios, mux->gpios, NULL,
-				       values);
+	gpiod_set_array_value_cansleep(mux->ngpios, mux->gpios, NULL, values);
 }
 
 static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
@@ -49,12 +49,6 @@ static int i2c_mux_gpio_deselect(struct i2c_mux_core *muxc, u32 chan)
 	return 0;
 }
 
-static int match_gpio_chip_by_label(struct gpio_chip *chip,
-					      void *data)
-{
-	return !strcmp(chip->label, data);
-}
-
 #ifdef CONFIG_OF
 static int i2c_mux_gpio_probe_dt(struct gpiomux *mux,
 					struct platform_device *pdev)
@@ -62,8 +56,8 @@ static int i2c_mux_gpio_probe_dt(struct gpiomux *mux,
 	struct device_node *np = pdev->dev.of_node;
 	struct device_node *adapter_np, *child;
 	struct i2c_adapter *adapter;
-	unsigned *values, *gpios;
-	int i = 0, ret;
+	unsigned *values;
+	int i = 0;
 
 	if (!np)
 		return -ENODEV;
@@ -100,29 +94,6 @@ static int i2c_mux_gpio_probe_dt(struct gpiomux *mux,
 	if (of_property_read_u32(np, "idle-state", &mux->data.idle))
 		mux->data.idle = I2C_MUX_GPIO_NO_IDLE;
 
-	mux->data.n_gpios = of_gpio_named_count(np, "mux-gpios");
-	if (mux->data.n_gpios < 0) {
-		dev_err(&pdev->dev, "Missing mux-gpios property in the DT.\n");
-		return -EINVAL;
-	}
-
-	gpios = devm_kcalloc(&pdev->dev,
-			     mux->data.n_gpios, sizeof(*mux->data.gpios),
-			     GFP_KERNEL);
-	if (!gpios) {
-		dev_err(&pdev->dev, "Cannot allocate gpios array");
-		return -ENOMEM;
-	}
-
-	for (i = 0; i < mux->data.n_gpios; i++) {
-		ret = of_get_named_gpio(np, "mux-gpios", i);
-		if (ret < 0)
-			return ret;
-		gpios[i] = ret;
-	}
-
-	mux->data.gpios = gpios;
-
 	return 0;
 }
 #else
@@ -139,8 +110,8 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
 	struct gpiomux *mux;
 	struct i2c_adapter *parent;
 	struct i2c_adapter *root;
-	unsigned initial_state, gpio_base;
-	int i, ret;
+	unsigned initial_state;
+	int i, ngpios, ret;
 
 	mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL);
 	if (!mux)
@@ -155,29 +126,19 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
 			sizeof(mux->data));
 	}
 
-	/*
-	 * If a GPIO chip name is provided, the GPIO pin numbers provided are
-	 * relative to its base GPIO number. Otherwise they are absolute.
-	 */
-	if (mux->data.gpio_chip) {
-		struct gpio_chip *gpio;
-
-		gpio = gpiochip_find(mux->data.gpio_chip,
-				     match_gpio_chip_by_label);
-		if (!gpio)
-			return -EPROBE_DEFER;
-
-		gpio_base = gpio->base;
-	} else {
-		gpio_base = 0;
+	ngpios = gpiod_count(&pdev->dev, "mux");
+	if (ngpios <= 0) {
+		dev_err(&pdev->dev, "no valid gpios provided\n");
+		return ngpios ?: -EINVAL;
 	}
+	mux->ngpios = ngpios;
 
 	parent = i2c_get_adapter(mux->data.parent);
 	if (!parent)
 		return -EPROBE_DEFER;
 
 	muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
-			     mux->data.n_gpios * sizeof(*mux->gpios), 0,
+			     ngpios * sizeof(*mux->gpios), 0,
 			     i2c_mux_gpio_select, NULL);
 	if (!muxc) {
 		ret = -ENOMEM;
@@ -191,7 +152,6 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
 	root = i2c_root_adapter(&parent->dev);
 
 	muxc->mux_locked = true;
-	mux->gpio_base = gpio_base;
 
 	if (mux->data.idle != I2C_MUX_GPIO_NO_IDLE) {
 		initial_state = mux->data.idle;
@@ -200,34 +160,28 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
 		initial_state = mux->data.values[0];
 	}
 
-	for (i = 0; i < mux->data.n_gpios; i++) {
+	for (i = 0; i < ngpios; i++) {
 		struct device *gpio_dev;
-		struct gpio_desc *gpio_desc;
+		struct gpio_desc *gpiod;
+		enum gpiod_flags flag;
 
-		ret = gpio_request(gpio_base + mux->data.gpios[i], "i2c-mux-gpio");
-		if (ret) {
-			dev_err(&pdev->dev, "Failed to request GPIO %d\n",
-				mux->data.gpios[i]);
-			goto err_request_gpio;
+		if (initial_state & BIT(i))
+			flag = GPIOD_OUT_HIGH;
+		else
+			flag = GPIOD_OUT_LOW;
+		gpiod = devm_gpiod_get_index(&pdev->dev, "mux", i, flag);
+		if (IS_ERR(gpiod)) {
+			ret = PTR_ERR(gpiod);
+			goto alloc_failed;
 		}
 
-		ret = gpio_direction_output(gpio_base + mux->data.gpios[i],
-					    initial_state & (1 << i));
-		if (ret) {
-			dev_err(&pdev->dev,
-				"Failed to set direction of GPIO %d to output\n",
-				mux->data.gpios[i]);
-			i++;	/* gpio_request above succeeded, so must free */
-			goto err_request_gpio;
-		}
-
-		gpio_desc = gpio_to_desc(gpio_base + mux->data.gpios[i]);
-		mux->gpios[i] = gpio_desc;
+		mux->gpios[i] = gpiod;
 
 		if (!muxc->mux_locked)
 			continue;
 
-		gpio_dev = &gpio_desc->gdev->dev;
+		/* FIXME: find a proper way to access the GPIO device */
+		gpio_dev = &gpiod->gdev->dev;
 		muxc->mux_locked = i2c_root_adapter(gpio_dev) == root;
 	}
 
@@ -250,10 +204,6 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
 
 add_adapter_failed:
 	i2c_mux_del_adapters(muxc);
-	i = mux->data.n_gpios;
-err_request_gpio:
-	for (; i > 0; i--)
-		gpio_free(gpio_base + mux->data.gpios[i - 1]);
 alloc_failed:
 	i2c_put_adapter(parent);
 
@@ -263,14 +213,8 @@ alloc_failed:
 static int i2c_mux_gpio_remove(struct platform_device *pdev)
 {
 	struct i2c_mux_core *muxc = platform_get_drvdata(pdev);
-	struct gpiomux *mux = i2c_mux_priv(muxc);
-	int i;
 
 	i2c_mux_del_adapters(muxc);
-
-	for (i = 0; i < mux->data.n_gpios; i++)
-		gpio_free(mux->gpio_base + mux->data.gpios[i]);
-
 	i2c_put_adapter(muxc->parent);
 
 	return 0;

drivers/i2c/muxes/i2c-mux-pinctrl.c

@@ -16,7 +16,7 @@
 
 struct i2c_mux_pinctrl {
 	struct pinctrl *pinctrl;
-	struct pinctrl_state **states;
+	struct pinctrl_state *states[];
 };
 
 static int i2c_mux_pinctrl_select(struct i2c_mux_core *muxc, u32 chan)
@@ -93,14 +93,13 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
 		return PTR_ERR(parent);
 
 	muxc = i2c_mux_alloc(parent, dev, num_names,
-			     sizeof(*mux) + num_names * sizeof(*mux->states),
+			     struct_size(mux, states, num_names),
 			     0, i2c_mux_pinctrl_select, NULL);
 	if (!muxc) {
 		ret = -ENOMEM;
 		goto err_put_parent;
 	}
 	mux = i2c_mux_priv(muxc);
-	mux->states = (struct pinctrl_state **)(mux + 1);
 
 	platform_set_drvdata(pdev, muxc);