Hi, Laurent
On 12/12/2014 10:17 AM, Laurent Pinchart wrote:
Hi Josh,
Thank you for the patch.
On Thursday 11 December 2014 15:35:39 Josh Wu wrote:
Add the document for ov2640 dt.
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Josh Wu <josh.wu@xxxxxxxxx>
---
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.
It could also be a variable clock provided by something else. I would just
drop the second sentence.
I mention this since these are the cases in at91 platform.
Sure. I'll drop it.
+- 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.
Those two properties are optional. I'm not sure they should even be mentioned
in the ov2640 bindings. For one thing they're not needed if the clock doesn't
need to be forced to a specific frequency, and the clock rate could also be
configured through other means depending on the platform.
hmm, if the clock is fixed then this 'assigned-clock-rates' is not needed.
And I only find one binding document mentioned the assigned-clocks. It
looks like a general property for all clocks. We don't need mention it
repeatedly.
So I'd like to drop this two properties in next version.
Thanks and Best Regards,
Josh Wu
+
+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@f0018000 {
+ ov2640: camera@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>;
+ };
+ };
+ };
+ };
--
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