ARM: dts: add PMU syscon node for exynos4

This patch adds a PMU(Power Management Unit) syscon node. This
should be required for USB Phy syscon regmap I/F.

Cc: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

Documentation/devicetree/bindings/arm/samsung/pmu.txt

@@ -2,6 +2,9 @@ SAMSUNG Exynos SoC series PMU Registers
 
 Properties:
  - compatible : should contain two values. First value must be one from following list:
+		   - "samsung,exynos4210-pmu" - for Exynos4210 SoC,
+		   - "samsung,exynos4212-pmu" - for Exynos4212 SoC,
+		   - "samsung,exynos4412-pmu" - for Exynos4412 SoC,
 		   - "samsung,exynos5250-pmu" - for Exynos5250 SoC,
 		   - "samsung,exynos5420-pmu" - for Exynos5420 SoC.
 		second value must be always "syscon".

arch/arm/boot/dts/exynos4.dtsi

@@ -128,6 +128,11 @@ sys_reg: syscon@10010000 {
 		reg = <0x10010000 0x400>;
 	};
 
+	pmu_system_controller: system-controller@10020000 {
+		compatible = "samsung,exynos4210-pmu", "syscon";
+		reg = <0x10020000 0x4000>;
+	};
+
 	dsi_0: dsi@11C80000 {
 		compatible = "samsung,exynos4210-mipi-dsi";
 		reg = <0x11C80000 0x10000>;

arch/arm/boot/dts/exynos4412.dtsi

@@ -29,4 +29,8 @@ combiner: interrupt-controller@10440000 {
 	gic: interrupt-controller@10490000 {
 		cpu-offset = <0x4000>;
 	};
+
+	pmu_system_controller: system-controller@10020000 {
+		compatible = "samsung,exynos4412-pmu", "syscon";
+	};
 };

arch/arm/boot/dts/exynos4x12.dtsi

@@ -137,6 +137,10 @@ pinctrl_3: pinctrl@106E0000 {
 		interrupts = <0 72 0>;
 	};
 
+	pmu_system_controller: system-controller@10020000 {
+		compatible = "samsung,exynos4212-pmu", "syscon";
+	};
+
 	g2d@10800000 {
 		compatible = "samsung,exynos4212-g2d";
 		reg = <0x10800000 0x1000>;