Add the device tree binding documentation for the ov7740 sensor driver.

Signed-off-by: Wenyou Yang <wenyou.y...@microchip.com>
Acked-by: Rob Herring <r...@kernel.org>
---

Changes in v9: None
Changes in v8: None
Changes in v7:
 - Add Acked-by tag.

Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3:
 - Explicitly document the "remote-endpoint" property.

Changes in v2: None

 .../devicetree/bindings/media/i2c/ov7740.txt       | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov7740.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/ov7740.txt 
b/Documentation/devicetree/bindings/media/i2c/ov7740.txt
new file mode 100644
index 000000000000..af781c3a5f0e
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/ov7740.txt
@@ -0,0 +1,47 @@
+* Omnivision OV7740 CMOS image sensor
+
+The Omnivision OV7740 image sensor supports multiple output image
+size, such as VGA, and QVGA, CIF and any size smaller. It also
+supports the RAW RGB and YUV output formats.
+
+The common video interfaces bindings (see video-interfaces.txt) should
+be used to specify link to the image data receiver. The OV7740 device
+node should contain one 'port' child node with an 'endpoint' subnode.
+
+Required Properties:
+- compatible:  "ovti,ov7740".
+- reg:         I2C slave address of the sensor.
+- clocks:      Reference to the xvclk input clock.
+- clock-names: "xvclk".
+
+Optional Properties:
+- reset-gpios: Rreference to the GPIO connected to the reset_b pin,
+  if any. Active low with pull-ip resistor.
+- powerdown-gpios: Reference to the GPIO connected to the pwdn pin,
+  if any. Active high with pull-down resistor.
+
+Endpoint node mandatory properties:
+- remote-endpoint: A phandle to the bus receiver's endpoint node.
+
+Example:
+
+       i2c1: i2c@fc028000 {
+               ov7740: camera@21 {
+                       compatible = "ovti,ov7740";
+                       reg = <0x21>;
+                       pinctrl-names = "default";
+                       pinctrl-0 = <&pinctrl_sensor_power 
&pinctrl_sensor_reset>;
+                       clocks = <&isc>;
+                       clock-names = "xvclk";
+                       assigned-clocks = <&isc>;
+                       assigned-clock-rates = <24000000>;
+                       reset-gpios = <&pioA 43 GPIO_ACTIVE_LOW>;
+                       powerdown-gpios = <&pioA 44 GPIO_ACTIVE_HIGH>;
+
+                       port {
+                               ov7740_0: endpoint {
+                                       remote-endpoint = <&isc_0>;
+                               };
+                       };
+               };
+       };
-- 
2.15.0

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