[media] media: adv7180: Add adv7180cp, adv7180st bindings

To differentiate between two classes of chip packages that have
different numbers of input ports.

Signed-off-by: Ulrich Hecht <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/devicetree/bindings/media/i2c/adv7180.txt

···
 Required Properties :
 - compatible : value must be one of
 		"adi,adv7180"
+		"adi,adv7180cp"
+		"adi,adv7180st"
 		"adi,adv7182"
 		"adi,adv7280"
 		"adi,adv7280-m"
···
 		"adi,adv7281-ma"
 		"adi,adv7282"
 		"adi,adv7282-m"
+
+Device nodes of "adi,adv7180cp" and "adi,adv7180st" must contain one
+'port' child node per device input and output port, in accordance with the
+video interface bindings defined in
+Documentation/devicetree/bindings/media/video-interfaces.txt. The port
+nodes are numbered as follows.
+
+  Port		adv7180cp	adv7180st
+-------------------------------------------------------------------
+  Input		0-2		0-5
+  Output	3		6
+
+The digital output port node must contain at least one endpoint.
 
 Optional Properties :
 - powerdown-gpios: reference to the GPIO connected to the powerdown pin,