[media] media: adv7180: Add device tree binding document

Add device tree binding documentation for the adv7180 video decoder family.

Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/Documentation/devicetree/bindings/media/i2c/adv7180.txt b/Documentation/devicetree/bindings/media/i2c/adv7180.txt
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index 0000000..2f39f26
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+++ b/Documentation/devicetree/bindings/media/i2c/adv7180.txt
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+* Analog Devices ADV7180 analog video decoder family
+
+The adv7180 family devices are used to capture analog video to different
+digital interfaces like parallel video.
+
+Required Properties :
+- compatible : value must be "adi,adv7180"
+
+Example:
+
+       i2c0@1c22000 {
+               ...
+               ...
+               adv7180@21 {
+                       compatible = "adi,adv7180";
+                       reg = <0x21>;
+               };
+               ...
+       };
+