ARM: dts: Enabling ehci-s5p driver for EXYNOS5250

Adding EHCI device tree node for Exynos5250 along with
the device base adress and gpio line for vbus.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

Documentation/devicetree/bindings/usb/exynos-usb.txt

@@ -0,0 +1,25 @@
+Samsung Exynos SoC USB controller
+
+The USB devices interface with USB controllers on Exynos SOCs.
+The device node has following properties.
+
+EHCI
+Required properties:
+ - compatible: should be "samsung,exynos4210-ehci" for USB 2.0
+   EHCI controller in host mode.
+ - reg: physical base address of the controller and length of memory mapped
+   region.
+ - interrupts: interrupt number to the cpu.
+
+Optional properties:
+ - samsung,vbus-gpio:  if present, specifies the GPIO that
+   needs to be pulled up for the bus to be powered.
+
+Example:
+
+	usb@12110000 {
+		compatible = "samsung,exynos4210-ehci";
+		reg = <0x12110000 0x100>;
+		interrupts = <0 71 0>;
+		samsung,vbus-gpio = <&gpx2 6 1 3 3>;
+	};

arch/arm/boot/dts/exynos5250-smdk5250.dts

@@ -232,6 +232,10 @@ sound {
 		samsung,audio-codec = <&wm8994>;
 	};
 
+	usb@12110000 {
+		samsung,vbus-gpio = <&gpx2 6 1 3 3>;
+	};
+
 	dp-controller {
 		samsung,color-space = <0>;
 		samsung,dynamic-range = <0>;

arch/arm/boot/dts/exynos5250-snow.dts

@@ -40,4 +40,8 @@ slot@0 {
 				<&gpc4 5 2 3 0>, <&gpc4 6 2 3 0>;
 		};
 	};
+
+	usb@12110000 {
+		samsung,vbus-gpio = <&gpx1 1 1 3 3>;
+	};
 };

arch/arm/boot/dts/exynos5250.dtsi

@@ -301,6 +301,12 @@ i2s2: i2s@12D70000 {
 		dma-names = "tx", "rx";
 	};
 
+	usb@12110000 {
+		compatible = "samsung,exynos4210-ehci";
+		reg = <0x12110000 0x100>;
+		interrupts = <0 71 0>;
+	};
+
 	amba {
 		#address-cells = <1>;
 		#size-cells = <1>;