Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC platform updates from Arnd Bergmann:
 "Most of the commits are for defconfig changes, to enable newly added
  drivers or features that people have started using. For the changed
  lines lines, we have mostly cleanups, the affected platforms are OMAP,
  Versatile, EP93xx, Samsung, Broadcom, i.MX, and Actions.

  The largest single change is the introduction of the TI "sysc" bus
  driver, with the intention of cleaning up more legacy code.

  Two new SoC platforms get added this time:

   - Allwinner R40 is a modernized version of the A20 chip, now with a
     Quad-Core ARM Cortex-A7. According to the manufacturer, it is
     intended for "Smart Hardware"

   - Broadcom Hurricane 2 (Aka Strataconnect BCM5334X) is a family of
     chips meant for managed gigabit ethernet switches, based around a
     Cortex-A9 CPU.

  Finally, we gain SMP support for two platforms: Renesas R-Car E2 and
  Amlogic Meson8/8b, which were previously added but only supported
  uniprocessor operation"

* tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (118 commits)
  ARM: multi_v7_defconfig: Select RPMSG_VIRTIO as module
  ARM: multi_v7_defconfig: enable CONFIG_GPIO_UNIPHIER
  arm64: defconfig: enable CONFIG_GPIO_UNIPHIER
  ARM: meson: enable MESON_IRQ_GPIO in Kconfig for meson8b
  ARM: meson: Add SMP bringup code for Meson8 and Meson8b
  ARM: smp_scu: allow the platform code to read the SCU CPU status
  ARM: smp_scu: add a helper for powering on a specific CPU
  dt-bindings: Amlogic: Add Meson8 and Meson8b SMP related documentation
  ARM: OMAP3: Delete an unnecessary variable initialisation in omap3xxx_hwmod_init()
  ARM: OMAP3: Use common error handling code in omap3xxx_hwmod_init()
  ARM: defconfig: select the right SX150X driver
  arm64: defconfig: Enable QCOM_IOMMU
  arm64: Add ThunderX drivers to defconfig
  arm64: defconfig: Enable Tegra PCI controller
  cpufreq: imx6q: Move speed grading check to cpufreq driver
  arm64: defconfig: re-enable Qualcomm DB410c USB
  ARM: configs: stm32: Add MDMA support in STM32 defconfig
  ARM: imx: Enable cpuidle for i.MX6DL starting at 1.1
  bus: ti-sysc: Fix unbalanced pm_runtime_enable by adding remove
  bus: ti-sysc: mark PM functions as __maybe_unused
  ...

arch/arm/kernel/smp_scu.c

@@ -21,6 +21,7 @@
 #define SCU_STANDBY_ENABLE	(1 << 5)
 #define SCU_CONFIG		0x04
 #define SCU_CPU_STATUS		0x08
+#define SCU_CPU_STATUS_MASK	GENMASK(1, 0)
 #define SCU_INVALIDATE		0x0c
 #define SCU_FPGA_REVISION	0x10
 
@@ -72,6 +73,24 @@ void scu_enable(void __iomem *scu_base)
 }
 #endif
 
+static int scu_set_power_mode_internal(void __iomem *scu_base,
+				       unsigned int logical_cpu,
+				       unsigned int mode)
+{
+	unsigned int val;
+	int cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(logical_cpu), 0);
+
+	if (mode > 3 || mode == 1 || cpu > 3)
+		return -EINVAL;
+
+	val = readb_relaxed(scu_base + SCU_CPU_STATUS + cpu);
+	val &= ~SCU_CPU_STATUS_MASK;
+	val |= mode;
+	writeb_relaxed(val, scu_base + SCU_CPU_STATUS + cpu);
+
+	return 0;
+}
+
 /*
  * Set the executing CPUs power mode as defined.  This will be in
  * preparation for it executing a WFI instruction.
@@ -82,15 +101,27 @@ void scu_enable(void __iomem *scu_base)
  */
 int scu_power_mode(void __iomem *scu_base, unsigned int mode)
 {
-	unsigned int val;
-	int cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(smp_processor_id()), 0);
+	return scu_set_power_mode_internal(scu_base, smp_processor_id(), mode);
+}
 
-	if (mode > 3 || mode == 1 || cpu > 3)
+/*
+ * Set the given (logical) CPU's power mode to SCU_PM_NORMAL.
+ */
+int scu_cpu_power_enable(void __iomem *scu_base, unsigned int cpu)
+{
+	return scu_set_power_mode_internal(scu_base, cpu, SCU_PM_NORMAL);
+}
+
+int scu_get_cpu_power_mode(void __iomem *scu_base, unsigned int logical_cpu)
+{
+	unsigned int val;
+	int cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(logical_cpu), 0);
+
+	if (cpu > 3)
 		return -EINVAL;
 
-	val = readb_relaxed(scu_base + SCU_CPU_STATUS + cpu) & ~0x03;
-	val |= mode;
-	writeb_relaxed(val, scu_base + SCU_CPU_STATUS + cpu);
+	val = readb_relaxed(scu_base + SCU_CPU_STATUS + cpu);
+	val &= SCU_CPU_STATUS_MASK;
 
-	return 0;
+	return val;
 }