Re: [PATCH 1/2] dt-bindings: leds: document Panasonic AN30259A bindings

[Jacek Anaszewski <jacek.anaszewski@gmail.com>]

On 02/20/2018 10:28 PM, Jacek Anaszewski wrote:
> Hi Simon,
> 
> Thank you for the patch. I have a few comments below.
> 
> On 02/20/2018 01:54 AM, Simon Shields wrote:
>> Signed-off-by: Simon Shields <simon@lineageos.org>
>> ---
>>  .../devicetree/bindings/leds/leds-an30259a.txt     | 41 ++++++++++++++++++++++
>>  1 file changed, 41 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/leds/leds-an30259a.txt
>>
>> diff --git a/Documentation/devicetree/bindings/leds/leds-an30259a.txt b/Documentation/devicetree/bindings/leds/leds-an30259a.txt
>> new file mode 100644
>> index 000000000000..d3586ce71eef
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/leds/leds-an30259a.txt
>> @@ -0,0 +1,41 @@
>> +* Panasonic AN30259A 3-channel LED driver
>> +
>> +The AN30259A is a LED controller capable of driving three LEDs independently. It supports
>> +constant current output and sloping current output modes. The chip is connected over I2C.
>> +
>> +Required properties:
>> +	- compatible : must be "panasonic,an30259a"
> 
> s/must/Must/ and please put a dot in the end.
> 
>> +	- reg -  I2C slave address
>> +
>> +Each led is represented as a sub-node of the panasonic,an30259a node.
> 
> s/led/LED/
> 
>> +
>> +Optional sub-node properties:
>> +	- label: see Documentation/devicetree/bindings/leds/common.txt
>> +	- linux,default-trigger: see Documentation/devicetree/bindings/leds/common.txt
>> +	- led-sources: 0 if LED is connected to LED1 pin,
> 
> led-sources is applicable in e bit different arrangements.
> Here please use "reg" property instead. In this case you will
> need also below in the "Required properties":
> 
> - #address-cells: Must be 1.
> - #size-cells: Must be 0.
> 
> 
>> +	  1 if LED is connected to LED2 pin, or 2 if LED is connected to LED3 pin.
>> +
>> +Example:
>> +an30259a@30 {
> 
> According to the lesson from Rob [0] it should be:
> 
> led-controller@30 {
>   #address-cells = <1>;
>   #size-cells = <0>
>   reg = <30>;
> 
>   led0 {
>     reg = <0>;
>     label = "red";	
>   };
> 
>   green@1 {
>     reg = <1>;
>     label = "green";
>   };
> 
>   blue@2 {
>     reg = <2>;
>     label = "blue";
>   };
> };

Of course s/green@1/led@1/ and s/blue@2/led@2/

Moreover, label should describe LED function, color
is only an extra info. Please refer to the other LED bindings
for a reference.

> 
>> +	compatible = "panasonic,an30259a";
>> +	reg = <0x30>;
>> +
>> +	red {
>> +		led-sources = <0>;
>> +		linux,default-trigger = "heartbeat";
>> +		label = "red";
>> +	};
>> +
>> +	green {
>> +		led-sources = <1>;
>> +		label = "green";
>> +	};
>> +
>> +	blue {
>> +		led-sources = <2>;
>> +		label = "blue";
>> +	};
>> +};
>> +
>> +For more information please see the link below:
>> +https://www.alliedelec.com/m/d/a9d2b3ee87c2d1a535a41dd747b1c247.pdf
>>
> 
> [0] https://patchwork.kernel.org/patch/10093757/
> 

-- 
Best regards,
Jacek Anaszewski