[media] tvp5150: Add device tree binding document

Add a Device Tree binding document for the TVP5150 video decoder.
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Documentation/devicetree/bindings/media/i2c/tvp5150.txt

+* Texas Instruments TVP5150 and TVP5151 video decoders
+
+The TVP5150 and TVP5151 are video decoders that convert baseband NTSC and PAL
+(and also SECAM in the TVP5151 case) video signals to either 8-bit 4:2:2 YUV
+with discrete syncs or 8-bit ITU-R BT.656 with embedded syncs output formats.
+
+Required Properties:
+- compatible: value must be "ti,tvp5150"
+- reg: I2C slave address
+
+Optional Properties:
+- pdn-gpios: phandle for the GPIO connected to the PDN pin, if any.
+- reset-gpios: phandle for the GPIO connected to the RESETB pin, if any.
+
+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.
+
+Required Endpoint Properties for parallel synchronization:
+
+- hsync-active: active state of the HSYNC signal. Must be <1> (HIGH).
+- vsync-active: active state of the VSYNC signal. Must be <1> (HIGH).
+- field-even-active: field signal level during the even field data
+  transmission. Must be <0>.
+
+If none of hsync-active, vsync-active and field-even-active is specified,
+the endpoint is assumed to use embedded BT.656 synchronization.
+
+Example:
+
+&i2c2 {
+	...
+	tvp5150@5c {
+		compatible = "ti,tvp5150";
+		reg = <0x5c>;
+		pdn-gpios = <&gpio4 30 GPIO_ACTIVE_LOW>;
+		reset-gpios = <&gpio6 7 GPIO_ACTIVE_LOW>;
+
+		port {
+			tvp5150_1: endpoint {
+				remote-endpoint = <&ccdc_ep>;
+			};
+		};
+	};
+};