[media] Documentation: DT: Add OV5647 bindings

Create device tree bindings documentation.

Signed-off-by: Ramiro Oliveira <roliveir@synopsys.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/Documentation/devicetree/bindings/media/i2c/ov5647.txt b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
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+Omnivision OV5647 raw image sensor
+---------------------------------
+
+OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces
+and CCI (I2C compatible) control bus.
+
+Required properties:
+
+- compatible           : "ovti,ov5647".
+- reg                  : I2C slave address of the sensor.
+- clocks               : Reference to the xclk clock.
+
+The common video interfaces bindings (see video-interfaces.txt) should be
+used to specify link to the image data receiver. The OV5647 device
+node should contain one 'port' child node with an 'endpoint' subnode.
+
+Endpoint node mandatory properties:
+
+- remote-endpoint: A phandle to the bus receiver's endpoint node.
+
+Example:
+
+       i2c@2000 {
+               ...
+               ov: camera@36 {
+                       compatible = "ovti,ov5647";
+                       reg = <0x36>;
+                       clocks = <&camera_clk>;
+                       port {
+                               camera_1: endpoint {
+                                       remote-endpoint = <&csi1_ep1>;
+                               };
+                       };
+               };
+       };