Doc/DT: Add DT binding documentation for DVI Connector

Add DT binding documentation for DVI Connector.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Archit Taneja <archit@ti.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --git a/Documentation/devicetree/bindings/video/dvi-connector.txt b/Documentation/devicetree/bindings/video/dvi-connector.txt
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+++ b/Documentation/devicetree/bindings/video/dvi-connector.txt
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+DVI Connector
+==============
+
+Required properties:
+- compatible: "dvi-connector"
+
+Optional properties:
+- label: a symbolic name for the connector
+- ddc-i2c-bus: phandle to the i2c bus that is connected to DVI DDC
+- analog: the connector has DVI analog pins
+- digital: the connector has DVI digital pins
+- dual-link: the connector has pins for DVI dual-link
+
+Required nodes:
+- Video port for DVI input
+
+Note: One (or both) of 'analog' or 'digital' must be set.
+
+Example
+-------
+
+dvi0: connector@0 {
+       compatible = "dvi-connector";
+       label = "dvi";
+
+       digital;
+
+       ddc-i2c-bus = <&i2c3>;
+
+       port {
+               dvi_connector_in: endpoint {
+                       remote-endpoint = <&tfp410_out>;
+               };
+       };
+};