* Nextchip NVP6158 AHD to BT656/BT1120 decoder

Required Properties:
- compatible: should be "nvp6158-v4l2"
- clocks: reference to the Single 27M Oscillator.
- clock-names: should be "xvclk".
- pwr-gpios: High active nvp6158 power gpio
- pwr2-gpios: High active ahd camera power gpio
- pwdn-gpios: High active nvp6158 pwdn gpio
- pwdn2-gpios: High active ahd camera pwdn gpio
- rst-gpios: High active nvp6158 reset gpio
- rst2-gpios: High active ahd camera reset gpio
Optional Properties:
- rockchip,dvp_mode: BT656 or BT1120 or BT656_TEST
- rockchip,channel_nums: channel nums, 1/2/4
- rockchip,dual_edge: dual edge, 0/1

NVP6158 device address 0x30(7bit);
The device node must contain one 'port' child node for its digital output
video port, in accordance with the video interface bindings defined in
Documentation/devicetree/bindings/media/video-interfaces.txt.

Example:

&i2c1 {
	status = "okay";

	nvp6158: nvp6158@30 {
		compatible = "nvp6158-v4l2";
		status = "okay";
		reg = <0x30>;
		clocks = <&cru CLK_CIF_OUT>;
		clock-names = "xvclk";
		power-domains = <&power RK3568_PD_VI>;
		pinctrl-names = "default";
		pinctrl-0 = <&cif_clk &cif_dvp_clk &cif_dvp_bus8 &cif_dvp_bus16>;
		pwr-gpios = <&gpio4 RK_PB2 GPIO_ACTIVE_HIGH>;
		pwr2-gpios = <&gpio4 RK_PB1 GPIO_ACTIVE_HIGH>;
		rst-gpios = <&gpio4 RK_PB5 GPIO_ACTIVE_HIGH>;
		/*rst2-gpios = <&gpio2 RK_PC5 GPIO_ACTIVE_HIGH>;*/
		/*pwdn-gpios = <&gpio4 RK_PA6 GPIO_ACTIVE_HIGH>;*/
		/*pwdn2-gpios = <&gpio4 RK_PA6 GPIO_ACTIVE_HIGH>;*/
		rockchip,camera-module-index = <0>;
		rockchip,camera-module-facing = "back";
		rockchip,camera-module-name = "default";
		rockchip,camera-module-lens-name = "default";
		rockchip,dvp_mode = "BT1120"; //BT656 or BT1120 or BT656_TEST
		rockchip,channel_nums = <4>; //channel nums, 1/2/4
		rockchip,dual_edge = <1>; // pclk dual edge, 0/1
		rockchip,default_rect= <1920 1080>; // default resolution
		port {
			nvp6158_out: endpoint {
				remote-endpoint = <&dvp_in_bcam1>;
			};
		};
	};
};