media: dt-bindings: media: Binding document for OV7251 camera sensor

* Omnivision 1/7.5-Inch B&W VGA CMOS Digital Image Sensor

The Omnivision OV7251 is a 1/7.5-Inch CMOS active pixel digital image sensor

with an active array size of 640H x 480V. It is programmable through a serial

I2C interface.

Required Properties:

- compatible: Value should be "ovti,ov7251".

- clocks: Reference to the xclk clock.

- clock-names: Should be "xclk".

- clock-frequency: Frequency of the xclk clock.

- enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds

  to the hardware pin XSHUTDOWN which is physically active low.

- vdddo-supply: Chip digital IO regulator.

- vdda-supply: Chip analog regulator.

- vddd-supply: Chip digital core regulator.

The device node shall contain one 'port' child node with a single 'endpoint'

subnode for its digital output video port, in accordance with the video

interface bindings defined in

Documentation/devicetree/bindings/media/video-interfaces.txt.

Example:

	&i2c1 {

		...

		ov7251: camera-sensor@60 {

			compatible = "ovti,ov7251";

			reg = <0x60>;

			enable-gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;

			pinctrl-names = "default";

			pinctrl-0 = <&camera_bw_default>;

			clocks = <&clks 200>;

			clock-names = "xclk";

			clock-frequency = <24000000>;

			vdddo-supply = <&camera_dovdd_1v8>;

			vdda-supply = <&camera_avdd_2v8>;

			vddd-supply = <&camera_dvdd_1v2>;

			port {

				ov7251_ep: endpoint {

					clock-lanes = <1>;

					data-lanes = <0>;

					remote-endpoint = <&csi0_ep>;

				};

			};

		};

	};