video: Add DT binding documentation for VGA connector

The VGA connector is described by a single input port and an optional
DDC bus.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

diff --git a/Documentation/devicetree/bindings/video/vga-connector.txt b/Documentation/devicetree/bindings/video/vga-connector.txt
new file mode 100644 (file)
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+++ b/Documentation/devicetree/bindings/video/vga-connector.txt
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+VGA Connector
+=============
+
+Required properties:
+
+- compatible: "vga-connector"
+
+Optional properties:
+
+- label: a symbolic name for the connector corresponding to a hardware label
+- ddc-i2c-bus: phandle to the I2C bus that is connected to VGA DDC
+
+Required nodes:
+
+The VGA connector internal connections are modeled using the OF graph bindings
+specified in Documentation/devicetree/bindings/graph.txt.
+
+The VGA connector has a single port that must be connected to a video source
+port.
+
+
+Example
+-------
+
+vga0: connector@0 {
+       compatible = "vga-connector";
+       label = "vga";
+
+       ddc-i2c-bus = <&i2c3>;
+
+       port {
+               vga_connector_in: endpoint {
+                       remote-endpoint = <&adv7123_out>;
+               };
+       };
+};