interconnect: imx: Add platform driver for imx8mn

Add a platform driver for the i.MX8MN SoC describing bus topology, based
on internal documentation.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Link: https://lore.kernel.org/r/338a5409ce88811ba6c940ba06441db3faa8c187.1586174566.git.leonard.crestez@nxp.com
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>

drivers/interconnect/imx/Kconfig

@@ -8,6 +8,10 @@ config INTERCONNECT_IMX8MM
 	tristate "i.MX8MM interconnect driver"
 	depends on INTERCONNECT_IMX
 
+config INTERCONNECT_IMX8MN
+	tristate "i.MX8MN interconnect driver"
+	depends on INTERCONNECT_IMX
+
 config INTERCONNECT_IMX8MQ
 	tristate "i.MX8MQ interconnect driver"
 	depends on INTERCONNECT_IMX

drivers/interconnect/imx/Makefile

@@ -1,7 +1,9 @@
 imx-interconnect-objs			:= imx.o
 imx8mm-interconnect-objs       		:= imx8mm.o
 imx8mq-interconnect-objs       		:= imx8mq.o
+imx8mn-interconnect-objs       		:= imx8mn.o
 
 obj-$(CONFIG_INTERCONNECT_IMX)		+= imx-interconnect.o
 obj-$(CONFIG_INTERCONNECT_IMX8MM)	+= imx8mm-interconnect.o
 obj-$(CONFIG_INTERCONNECT_IMX8MQ)	+= imx8mq-interconnect.o
+obj-$(CONFIG_INTERCONNECT_IMX8MN)	+= imx8mn-interconnect.o

drivers/interconnect/imx/imx8mn.c

@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Interconnect framework driver for i.MX8MN SoC
+ *
+ * Copyright (c) 2019-2020, NXP
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <dt-bindings/interconnect/imx8mn.h>
+
+#include "imx.h"
+
+static const struct imx_icc_node_adj_desc imx8mn_dram_adj = {
+	.bw_mul = 1,
+	.bw_div = 4,
+	.phandle_name = "fsl,ddrc",
+};
+
+static const struct imx_icc_node_adj_desc imx8mn_noc_adj = {
+	.bw_mul = 1,
+	.bw_div = 4,
+	.main_noc = true,
+};
+
+/*
+ * Describe bus masters, slaves and connections between them
+ *
+ * This is a simplified subset of the bus diagram, there are several other
+ * PL301 nics which are skipped/merged into PL301_MAIN
+ */
+static struct imx_icc_node_desc nodes[] = {
+	DEFINE_BUS_INTERCONNECT("NOC", IMX8MN_ICN_NOC, &imx8mn_noc_adj,
+			IMX8MN_ICS_DRAM, IMX8MN_ICN_MAIN),
+
+	DEFINE_BUS_SLAVE("DRAM", IMX8MN_ICS_DRAM, &imx8mn_dram_adj),
+	DEFINE_BUS_SLAVE("OCRAM", IMX8MN_ICS_OCRAM, NULL),
+	DEFINE_BUS_MASTER("A53", IMX8MN_ICM_A53, IMX8MN_ICN_NOC),
+
+	/* GPUMIX */
+	DEFINE_BUS_MASTER("GPU", IMX8MN_ICM_GPU, IMX8MN_ICN_GPU),
+	DEFINE_BUS_INTERCONNECT("PL301_GPU", IMX8MN_ICN_GPU, NULL, IMX8MN_ICN_NOC),
+
+	/* DISPLAYMIX */
+	DEFINE_BUS_MASTER("CSI1", IMX8MN_ICM_CSI1, IMX8MN_ICN_MIPI),
+	DEFINE_BUS_MASTER("CSI2", IMX8MN_ICM_CSI2, IMX8MN_ICN_MIPI),
+	DEFINE_BUS_MASTER("ISI", IMX8MN_ICM_ISI, IMX8MN_ICN_MIPI),
+	DEFINE_BUS_MASTER("LCDIF", IMX8MN_ICM_LCDIF, IMX8MN_ICN_MIPI),
+	DEFINE_BUS_INTERCONNECT("PL301_MIPI", IMX8MN_ICN_MIPI, NULL, IMX8MN_ICN_NOC),
+
+	/* USB goes straight to NOC */
+	DEFINE_BUS_MASTER("USB", IMX8MN_ICM_USB, IMX8MN_ICN_NOC),
+
+	/* Audio */
+	DEFINE_BUS_MASTER("SDMA2", IMX8MN_ICM_SDMA2, IMX8MN_ICN_AUDIO),
+	DEFINE_BUS_MASTER("SDMA3", IMX8MN_ICM_SDMA3, IMX8MN_ICN_AUDIO),
+	DEFINE_BUS_INTERCONNECT("PL301_AUDIO", IMX8MN_ICN_AUDIO, NULL, IMX8MN_ICN_MAIN),
+
+	/* Ethernet */
+	DEFINE_BUS_MASTER("ENET", IMX8MN_ICM_ENET, IMX8MN_ICN_ENET),
+	DEFINE_BUS_INTERCONNECT("PL301_ENET", IMX8MN_ICN_ENET, NULL, IMX8MN_ICN_MAIN),
+
+	/* Other */
+	DEFINE_BUS_MASTER("SDMA1", IMX8MN_ICM_SDMA1, IMX8MN_ICN_MAIN),
+	DEFINE_BUS_MASTER("NAND", IMX8MN_ICM_NAND, IMX8MN_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC1", IMX8MN_ICM_USDHC1, IMX8MN_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC2", IMX8MN_ICM_USDHC2, IMX8MN_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC3", IMX8MN_ICM_USDHC3, IMX8MN_ICN_MAIN),
+	DEFINE_BUS_INTERCONNECT("PL301_MAIN", IMX8MN_ICN_MAIN, NULL,
+			IMX8MN_ICN_NOC, IMX8MN_ICS_OCRAM),
+};
+
+static int imx8mn_icc_probe(struct platform_device *pdev)
+{
+	return imx_icc_register(pdev, nodes, ARRAY_SIZE(nodes));
+}
+
+static int imx8mn_icc_remove(struct platform_device *pdev)
+{
+	return imx_icc_unregister(pdev);
+}
+
+static struct platform_driver imx8mn_icc_driver = {
+	.probe = imx8mn_icc_probe,
+	.remove = imx8mn_icc_remove,
+	.driver = {
+		.name = "imx8mn-interconnect",
+	},
+};
+
+module_platform_driver(imx8mn_icc_driver);
+MODULE_ALIAS("platform:imx8mn-interconnect");
+MODULE_AUTHOR("Leonard Crestez <leonard.crestez@nxp.com>");
+MODULE_LICENSE("GPL v2");