[media] media: mt9m111: add device-tree documentation

Add device-tree bindings documentation for the Micron mt9m111 image
sensor.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Documentation/devicetree/bindings/media/i2c/mt9m111.txt

+Micron 1.3Mp CMOS Digital Image Sensor
+
+The Micron MT9M111 is a CMOS active pixel digital image sensor with an active
+array size of 1280H x 1024V. It is programmable through a simple two-wire serial
+interface.
+
+Required Properties:
+- compatible: value should be "micron,mt9m111"
+
+For further reading on port node refer to
+Documentation/devicetree/bindings/media/video-interfaces.txt.
+
+Example:
+
+	i2c_master {
+		mt9m111@5d {
+			compatible = "micron,mt9m111";
+			reg = <0x5d>;
+
+			remote = <&pxa_camera>;
+			port {
+				mt9m111_1: endpoint {
+					bus-width = <8>;
+					remote-endpoint = <&pxa_camera>;
+				};
+			};
+		};
+	};