media: dt: bindings: Add lens-focus binding for image sensors

The lens-focus property contains a phandle to the lens voice coil driver
that is associated to the sensor; typically both are contained in the same
camera module.
Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Cc: devicetree@vger.kernel.org
Acked-by: NPavel Machek <pavel@ucw.cz>
Reviewed-by: NSebastian Reichel <sebastian.reichel@collabora.co.uk>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/devicetree/bindings/media/video-interfaces.txt

@@ -83,6 +83,8 @@ Optional properties
 - flash-leds: An array of phandles, each referring to a flash LED, a sub-node
   of the LED driver device node.
 
+- lens-focus: A phandle to the node of the focus lens controller.
+
 
 Optional endpoint properties
 ----------------------------