This adds a device tree binding documentation for OV7720/OV7725 sensor.

Cc: Jacopo Mondi <jacopo+rene...@jmondi.org>
Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Cc: Hans Verkuil <hans.verk...@cisco.com>
Cc: Sakari Ailus <sakari.ai...@linux.intel.com>
Cc: Mauro Carvalho Chehab <mche...@s-opensource.com>
Cc: Rob Herring <robh...@kernel.org>
Signed-off-by: Akinobu Mita <akinobu.m...@gmail.com>
---
* v2
- Add "dt-bindings:" in the subject
- Add a brief description of the sensor
- Update the GPIO names
- Indicate the GPIO active level

 .../devicetree/bindings/media/i2c/ov772x.txt       | 42 ++++++++++++++++++++++
 MAINTAINERS                                        |  1 +
 2 files changed, 43 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov772x.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/ov772x.txt 
b/Documentation/devicetree/bindings/media/i2c/ov772x.txt
new file mode 100644
index 0000000..b045503
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/ov772x.txt
@@ -0,0 +1,42 @@
+* Omnivision OV7720/OV7725 CMOS sensor
+
+The Omnivision OV7720/OV7725 sensor supports multiple resolutions output,
+such as VGA, QVGA, and any size scaling down from CIF to 40x30. It also can
+support the YUV422, RGB565/555/444, GRB422 or raw RGB output formats.
+
+Required Properties:
+- compatible: shall be one of
+       "ovti,ov7720"
+       "ovti,ov7725"
+- clocks: reference to the xclk input clock.
+- clock-names: shall be "xclk".
+
+Optional Properties:
+- reset-gpios: reference to the GPIO connected to the RSTB pin which is
+  active low, if any.
+- powerdown-gpios: reference to the GPIO connected to the PWDN pin which is
+  active high, if any.
+
+The device node shall contain one 'port' child node with one child 'endpoint'
+subnode for its digital output video port, in accordance with the video
+interface bindings defined in Documentation/devicetree/bindings/media/
+video-interfaces.txt.
+
+Example:
+
+&i2c0 {
+       ov772x: camera@21 {
+               compatible = "ovti,ov7725";
+               reg = <0x21>;
+               reset-gpios = <&axi_gpio_0 0 GPIO_ACTIVE_LOW>;
+               powerdown-gpios = <&axi_gpio_0 1 GPIO_ACTIVE_LOW>;
+               clocks = <&xclk>;
+               clock-names = "xclk";
+
+               port {
+                       ov772x_0: endpoint {
+                               remote-endpoint = <&vcap1_in0>;
+                       };
+               };
+       };
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 0a1410d..f500953 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10344,6 +10344,7 @@ T:      git git://linuxtv.org/media_tree.git
 S:     Odd fixes
 F:     drivers/media/i2c/ov772x.c
 F:     include/media/i2c/ov772x.h
+F:     Documentation/devicetree/bindings/media/i2c/ov772x.txt
 
 OMNIVISION OV7740 SENSOR DRIVER
 M:     Wenyou Yang <wenyou.y...@microchip.com>
-- 
2.7.4

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