video: Add ADV7123 DT bindings documentation

The ADV7123 is a video DAC described by an input port, an output port,
and an optional power save GPIO.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2014-08-26 19:56:06 +02:00
commit 8d0f1956f7