linux-kernel - Re: [PATCH 3/3] ARM: dts: exynos: add function and color to aat1290 flash LED node in Galaxy S3

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Date:   Sun, 12 Jun 2022 19:06:09 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        Simon Shields <simon@...eageos.org>,
        Martin Jücker <martin.juecker@...il.com>
Subject: Re: [PATCH 3/3] ARM: dts: exynos: add function and color to aat1290
 flash LED node in Galaxy S3

On 12/06/2022 17:09, Jacek Anaszewski wrote:
> On 6/10/22 12:14, Krzysztof Kozlowski wrote:
>> On 09/06/2022 22:31, Jacek Anaszewski wrote:
>>> Hi Krzysztof,
>>>
>>> On 6/7/22 10:53, Krzysztof Kozlowski wrote:
>>>> Add common LED properties - the function and color - to aat1290 flash
>>>> LED node in Galaxy S3.
>>>>
>>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>>> ---
>>>>    arch/arm/boot/dts/exynos4412-galaxy-s3.dtsi | 3 +++
>>>>    1 file changed, 3 insertions(+)
>>>>
>>>> diff --git a/arch/arm/boot/dts/exynos4412-galaxy-s3.dtsi b/arch/arm/boot/dts/exynos4412-galaxy-s3.dtsi
>>>> index 72901772fcad..d76f3678dcab 100644
>>>> --- a/arch/arm/boot/dts/exynos4412-galaxy-s3.dtsi
>>>> +++ b/arch/arm/boot/dts/exynos4412-galaxy-s3.dtsi
>>>> @@ -7,6 +7,7 @@
>>>>     */
>>>>    
>>>>    /dts-v1/;
>>>> +#include <dt-bindings/leds/common.h>
>>>>    #include "exynos4412-midas.dtsi"
>>>>    
>>>>    / {
>>>> @@ -27,6 +28,8 @@ led-controller {
>>>>    
>>>>    		led {
>>>>    			label = "flash";
>>>> +			function = LED_FUNCTION_FLASH;
>>>> +			color = <LED_COLOR_ID_WHITE>;
>>>
>>> Addition of these two properties will not change anything because
>>> the label has precedence. It is deprecated, but if you introduce
>>> function and color to the binding instead of the label, the resulting
>>> LED class device name will change.
>>
>> Which is not necessarily what we want, right? Adding these properties is
>> a proper description of hardware, regardless whether current Linux
>> implementation uses them or not.
> 
> Actually I'd just drop label in addition to your change.
> I don't think it would break anybody seriously - not expecting it has
> any larger group of users and having uniformly constructed DTS files
> in the mainline has greater value.
> 

What about some PostmarketOSos, LineageOS and other OSes?

Let me Cc here some folks - Simon, Martin, is the label in flash LED
node anyhow important for you? Can it be dropped and replaced with
function+color?

https://lore.kernel.org/all/20220607085343.72414-3-krzysztof.kozlowski@linaro.org/

Best regards,
Krzysztof