ARM: dts: add device tree support for exynos5 hdmi

This patch adds support for device tree based discovery for exynos5
hdmi. Hdmi node is also renamed with "exynos5-hdmi".
Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

Documentation/devicetree/bindings/drm/exynos/hdmi.txt

+Device-Tree bindings for drm hdmi driver
+
+Required properties:
+- compatible: value should be "samsung,exynos5-hdmi".
+- reg: physical base address of the hdmi and length of memory mapped
+	region.
+- interrupts: interrupt number to the cpu.
+- hpd-gpio: following information about the hotplug gpio pin.
+	a) phandle of the gpio controller node.
+	b) pin number within the gpio controller.
+	c) pin function mode.
+	d) optional flags and pull up/down.
+	e) drive strength.
+
+Example:
+
+	hdmi {
+		compatible = "samsung,exynos5-hdmi";
+		reg = <0x14530000 0x100000>;
+		interrupts = <0 95 0>;
+		hpd-gpio = <&gpx3 7 0xf 1 3>;
+	};

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

@@ -166,4 +166,8 @@ partition@40000 {
 	spi_2: spi@12d40000 {
 		status = "disabled";
 	};
+
+	hdmi {
+		hpd-gpio = <&gpx3 7 0xf 1 3>;
+	};
 };

arch/arm/boot/dts/exynos5250.dtsi

@@ -520,4 +520,10 @@ gsc_3:  gsc@0x13e30000 {
 		reg = <0x13e30000 0x1000>;
 		interrupts = <0 88 0>;
 	};
+
+	hdmi {
+		compatible = "samsung,exynos5-hdmi";
+		reg = <0x14530000 0x100000>;
+		interrupts = <0 95 0>;
+	};
 };

arch/arm/mach-exynos/mach-exynos5-dt.c

@@ -72,6 +72,8 @@ static const struct of_dev_auxdata exynos5250_auxdata_lookup[] __initconst = {
 				"exynos-gsc.2", NULL),
 	OF_DEV_AUXDATA("samsung,exynos5-gsc", EXYNOS5_PA_GSC3,
 				"exynos-gsc.3", NULL),
+	OF_DEV_AUXDATA("samsung,exynos5-hdmi", 0x14530000,
+				"exynos5-hdmi", NULL),
 	{},
 };