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

Add the document for ov7251 device tree binding.

CC: Rob Herring <robh@kernel.org>
CC: Mark Rutland <mark.rutland@arm.com>
CC: devicetree@vger.kernel.org
Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/Documentation/devicetree/bindings/media/i2c/ov7251.txt b/Documentation/devicetree/bindings/media/i2c/ov7251.txt
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+* 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>;
+                               };
+                       };
+               };
+       };