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

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Date:   Tue, 21 Jun 2022 01:47:48 +0200
From:   Denis 'GNUtoo' Carikli <GNUtoo@...erdimension.org>
To:     Krzysztof Kozlowski via Replicant <replicant@...osl.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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: [Replicant] [PATCH 3/3] ARM: dts: exynos: add function and
 color to aat1290 flash LED node in Galaxy S3

On Sun, 12 Jun 2022 19:06:09 +0200
Krzysztof Kozlowski via Replicant <replicant@...osl.org> wrote:

> 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?
We don't have flash or camera support yet with Replicant version(s) that
use kernel(s) based on upstream Linux, so it won't break anything.

Denis.

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