Re: [PATCH v4 2/2] [media] atmel-isc: DT binding for Image Sensor Controller driver

Wu, Songjun
2016-06-12T03:04:27Z

On 6/9/2016 05:57, Boris Brezillon wrote:
> On Tue, 7 Jun 2016 15:11:53 +0800
> Songjun Wu <songjun.wu-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org> wrote:
>
>> DT binding documentation for ISC driver.
>>
>> Signed-off-by: Songjun Wu <songjun.wu-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
>> ---
>>
>> Changes in v4:
>> - Remove the isc clock nodes.
>>
>> Changes in v3:
>> - Remove the 'atmel,sensor-preferred'.
>> - Modify the isc clock node according to the Rob's remarks.
>>
>> Changes in v2:
>> - Remove the unit address of the endpoint.
>> - Add the unit address to the clock node.
>> - Avoid using underscores in node names.
>> - Drop the "0x" in the unit address of the i2c node.
>> - Modify the description of 'atmel,sensor-preferred'.
>> - Add the description for the ISC internal clock.
>>
>> .../devicetree/bindings/media/atmel-isc.txt | 69 ++++++++++++++++++++++
>> 1 file changed, 69 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/media/atmel-isc.txt
>>
>> diff --git a/Documentation/devicetree/bindings/media/atmel-isc.txt b/Documentation/devicetree/bindings/media/atmel-isc.txt
>> new file mode 100644
>> index 0000000..3f83524
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/atmel-isc.txt
>> @@ -0,0 +1,69 @@
>> +Atmel Image Sensor Controller (ISC)
>> +----------------------------------------------
>> +
>> +Required properties for ISC:
>> +- compatible
>> + Must be "atmel,sama5d2-isc".
>> +- reg
>> + Physical base address and length of the registers set for the device.
>> +- interrupts
>> + Should contain IRQ line for the ISC.
>> +- clocks
>> + List of clock specifiers, corresponding to entries in
>> + the clock-names property;
>> + Please refer to clock-bindings.txt.
>> +- clock-names
>> + Required elements: "hclock".
>> +- #clock-cells
>> + Should be 0.
>> +- clock-output-names
>> + Should contain the name of the clock driving the sensor master clock.
>> +- pinctrl-names, pinctrl-0
>> + Please refer to pinctrl-bindings.txt.
>> +
>> +
>> +ISC supports a single port node with parallel bus. It should contain one
>> +'port' child node with child 'endpoint' node. Please refer to the bindings
>> +defined in Documentation/devicetree/bindings/media/video-interfaces.txt.
>> +
>> +Example:
>> +isc: isc@f0008000 {
>> + compatible = "atmel,sama5d2-isc";
>> + reg = <0xf0008000 0x4000>;
>> + interrupts = <46 IRQ_TYPE_LEVEL_HIGH 5>;
>> + clocks = <&isc_clk>, <&iscck>, <&isc_gclk>;
>> + clock-names = "hclock";
>
> You have 3 clocks here and only one name. Are you sure this example is
> actually working?
>
The isc_clk is mandatory, but the other two clocks are optional, so I
did not give their name. This example is tested.
Should I add the name for the other two clocks?

>> + #clock-cells = <0>;
>> + clock-output-names = "isc-mck";
>> +
>> + port {
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> +
>> + isc_0: endpoint {
>> + remote-endpoint = <&ov7740_0>;
>> + hsync-active = <1>;
>> + vsync-active = <0>;
>> + pclk-sample = <1>;
>> + };
>> + };
>> +
>> +
>> +};
>> +
>> +i2c1: i2c@fc028000 {
>> + ov7740: camera@21 {
>> + compatible = "ovti,ov7740";
>> + reg = <0x21>;
>> +
>> + clocks = <&isc>;
>> + clock-names = "xvclk";
>> + assigned-clocks = <&isc>;
>> + assigned-clock-rates = <24000000>;
>> +
>> + port {
>> + ov7740_0: endpoint {
>> + remote-endpoint = <&isc_0>;
>> + };
>> + };
>> +};