* Omnivision OV2680 MIPI CSI-2 sensor

Required Properties:
- compatible: should be "ovti,ov2680"
- clocks: reference to the 24M xvclk input clock.
- clock-names: should be "xvclk".
- dovdd-supply: Digital I/O voltage supply, 1.8 volts
- avdd-supply: Analog voltage supply, 2.8 volts
- dvdd-supply: Digital core voltage supply, 1.5 volts
- powerdown-gpios: Low active powerdown gpio

Attention:
OV2680 device address 0x6c(8bit) or 0x20(8bit) is decided by SID pin;

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:
	ov2680: ov2680@36 {  // or ov2680: ov2680@10
		status = "okay";
		compatible = "ovti,ov2680";
		reg = <0x36>; //or reg = <0x10>;
		clocks = <&cru SCLK_CIF_OUT>;
		clock-names = "xvclk";

		avdd-supply = <&vcc2v8_dvp>;
		dovdd-supply = <&vcc1v8_dvp>;
		dvdd-supply = <&vdd1v5_dvp>;
		pinctrl-names = "rockchip,camera_default";
		pinctrl-0 = <&cif_clkout_m0>;
		pwdn-gpios = <&gpio2 13 GPIO_ACTIVE_LOW>;
		rockchip,camera-module-index = <1>;
		rockchip,camera-module-facing = "back";
		rockchip,camera-module-name = "default";
		rockchip,camera-module-lens-name = "default";
		port {
			ucam_out: endpoint {
				remote-endpoint = <&mipi_in_ucam>;
				data-lanes = <1>;
			};
		};
	};
