dt-bindings: add document for Innosilicon HDMI on Rockchip platform

Rockchip specific extensions to the Innosilicon HDMI

================================

Required properties:

- compatible:

	"rockchip,rk3036-inno-hdmi";

- reg:

	Physical base address and length of the controller's registers.

- clocks, clock-names:

	Phandle to hdmi controller clock, name should be "pclk"

- interrupts:

	HDMI interrupt number

- ports:

	Contain one port node with endpoint definitions as defined in

	Documentation/devicetree/bindings/graph.txt.

- pinctrl-0, pinctrl-name:

	Switch the iomux of HPD/CEC pins to HDMI function.

Example:

hdmi: hdmi@20034000 {

	compatible = "rockchip,rk3036-inno-hdmi";

	reg = <0x20034000 0x4000>;

	interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>;

	clocks = <&cru  PCLK_HDMI>;

	clock-names = "pclk";

	pinctrl-names = "default";

	pinctrl-0 = <&hdmi_ctl>;

	status = "disabled";

	hdmi_in: port {

		#address-cells = <1>;

		#size-cells = <0>;

		hdmi_in_lcdc: endpoint@0 {

			reg = <0>;

			remote-endpoint = <&lcdc_out_hdmi>;

		};

	};

};

&pinctrl {

	hdmi {

		hdmi_ctl: hdmi-ctl {

			rockchip,pins = <1 8  RK_FUNC_1 &pcfg_pull_none>,

					<1 9  RK_FUNC_1 &pcfg_pull_none>,

					<1 10 RK_FUNC_1 &pcfg_pull_none>,

					<1 11 RK_FUNC_1 &pcfg_pull_none>;

		};

	};

};