[v3][PATCH 5/5] media: ov2640: dt: add the device tree binding document

[josh.wu@atmel.com (Josh Wu)]

Add the document for ov2640 dt.

Cc: devicetree at vger.kernel.org
Signed-off-by: Josh Wu <josh.wu@atmel.com>
---
v2 -> v3:
  1. fix incorrect description.
  2. Add assigned-clocks & assigned-clock-rates.
  3. resetb pin should be ACTIVE_LOW.

v1 -> v2:
  1. change the compatible string to be consistent with verdor file.
  2. change the clock and pins' name.
  3. add missed pinctrl in example.

 .../devicetree/bindings/media/i2c/ov2640.txt       | 53 ++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/ov2640.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/ov2640.txt b/Documentation/devicetree/bindings/media/i2c/ov2640.txt
new file mode 100644
index 0000000..958e120
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/ov2640.txt
@@ -0,0 +1,53 @@
+* Omnivision ov2640 CMOS sensor
+
+The Omnivision OV2640 sensor support multiple resolutions output, such as
+CIF, SVGA, UXGA. It also can support YUV422/420, RGB565/555 or raw RGB
+output format.
+
+Required Properties:
+- compatible: Must be "ovti,ov2640"
+- clocks: reference to the xvclk input clock. It can be an external fixed
+          clock or a programmable clock from SoC.
+- clock-names: Must be "xvclk".
+- assigned-clocks: reference to the above 'clocks' property.
+- assigned-clock-rates: reference to the clock frequency of xvclk. Typical
+                        value is 25Mhz (25000000).
+                        This clock should only have single user. Specifying
+                        Conflicting rate configuration in multiple consumer
+                        nodes for a shared clock is forbidden.
+
+Optional Properties:
+- resetb-gpios: reference to the GPIO connected to the resetb pin, if any.
+- pwdn-gpios: reference to the GPIO connected to the pwdn pin, if any.
+
+The device node must contain one 'port' child node for its digital output
+video port, in accordance with the video interface bindings defined in
+Documentation/devicetree/bindings/media/video-interfaces.txt.
+
+Example:
+
+	i2c1: i2c at f0018000 {
+		ov2640: camera at 0x30 {
+			compatible = "ovti,ov2640";
+			reg = <0x30>;
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&pinctrl_pck1 &pinctrl_ov2640_pwdn &pinctrl_ov2640_resetb>;
+
+			resetb-gpios = <&pioE 24 GPIO_ACTIVE_LOW>;
+			pwdn-gpios = <&pioE 29 GPIO_ACTIVE_HIGH>;
+
+			clocks = <&pck1>;
+			clock-names = "xvclk";
+
+			assigned-clocks = <&pck1>;
+			assigned-clock-rates = <25000000>;
+
+			port {
+				ov2640_0: endpoint {
+					remote-endpoint = <&isi_0>;
+					bus-width = <8>;
+				};
+			};
+		};
+	};
-- 
1.9.1