linux-kernel - Re: [PATCH v2 8/8] Documentation: leds: Add "rgb:status" path

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Date:   Thu, 27 Apr 2023 19:50:47 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     Lee Jones <lee@...nel.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Pavel Machek <pavel@....cz>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 8/8] Documentation: leds: Add "rgb:status" path

On Donnerstag, 27. April 2023 18:05:59 CEST Lee Jones wrote:
> On Tue, 18 Apr 2023, Luca Weiss wrote:
> > The path /sys/class/leds/rgb:status is already widely used with the
> > qcom-lpg driver and others. Document it.
> 
> Where is this used?
> 
> $ grep status drivers/leds/rgb/leds-qcom-lpg.c
> <no results>

This is set in devicetree, e.g. from qcom-msm8974pro-fairphone-fp2.dts[0]:

    color = <LED_COLOR_ID_RGB>;
    function = LED_FUNCTION_STATUS;

And then something in the LED core sets the name based on that, I'd have
to dig to find where exactly.

Regards
Luca

[0] https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/qcom-msm8974pro-fairphone-fp2.dts#L105-L106

> 
> > Signed-off-by: Luca Weiss <luca@...tu.xyz>
> > ---
> > 
> >  Documentation/leds/well-known-leds.txt | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/Documentation/leds/well-known-leds.txt
> > b/Documentation/leds/well-known-leds.txt index 2160382c86be..439d4dac4472
> > 100644
> > --- a/Documentation/leds/well-known-leds.txt
> > +++ b/Documentation/leds/well-known-leds.txt
> > @@ -58,6 +58,7 @@ LEDs on notebook body, indicating that sound input /
> > output is muted.> 
> >  * System notification
> > 
> > +Good: "rgb:status"
> > 
> >  Legacy: "status-led:{red,green,blue}" (Motorola Droid 4)
> >  Legacy: "lp5523:{r,g,b}" (Nokia N900)