linux-kernel - Re: [Linux-stm32] [PATCH v7 10/12] ARM: dts: stm32: Fix schema warnings for pwm-leds

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Date:   Tue, 27 Oct 2020 11:05:38 +0100
From:   Alexander Dahl <post@...pocky.de>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     Alexander Dahl <post@...pocky.de>, Pavel Machek <pavel@....cz>,
        Dan Murphy <dmurphy@...com>, Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        Alexander Dahl <ada@...rsis.com>, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-amlogic@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-leds@...r.kernel.org
Subject: Re: [Linux-stm32] [PATCH v7 10/12] ARM: dts: stm32: Fix schema
 warnings for pwm-leds

Hello Ahmad,

thanks for your feedback, comments below.

On Tue, Oct 27, 2020 at 08:03:40AM +0100, Ahmad Fatoum wrote:
> Hello Alexander,
> 
> On 10/5/20 10:34 PM, Alexander Dahl wrote:
> > The node names for devices using the pwm-leds driver follow a certain
> > naming scheme (now).  Parent node name is not enforced, but recommended
> > by DT project.
> > 
> >   DTC     arch/arm/boot/dts/stm32mp157c-lxa-mc1.dt.yaml
> >   CHECK   arch/arm/boot/dts/stm32mp157c-lxa-mc1.dt.yaml
> > /home/alex/build/linux/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dt.yaml: led-rgb: 'led-blue', 'led-green', 'led-red' do not match any of the regexes: '^led(-[0-9a-f]+)?$', 'pinctrl-[0-9]+'
> >         From schema: /home/alex/src/linux/leds/Documentation/devicetree/bindings/leds/leds-pwm.yaml
> > 
> > Signed-off-by: Alexander Dahl <post@...pocky.de>
> 
> Acked-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> 
> But got two questions below:
> 
> > ---
> > 
> > Notes:
> >     v6 -> v7:
> >       * split up patch (one per sub arch)
> >       * added actual warnings to commit message
> > 
> >  arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts | 12 ++++++------
> >  1 file changed, 6 insertions(+), 6 deletions(-)
> > 
> > diff --git a/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts b/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts
> > index 5700e6b700d3..25d548cb975b 100644
> > --- a/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts
> > +++ b/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts
> > @@ -36,34 +36,34 @@
> >  		stdout-path = &uart4;
> >  	};
> >  
> > -	led-act {
> > +	led-controller-1 {
> >  		compatible = "gpio-leds";
> >  
> > -		led-green {
> > +		led-1 {
> >  			label = "mc1:green:act";
> >  			gpios = <&gpioa 13 GPIO_ACTIVE_LOW>;
> >  			linux,default-trigger = "heartbeat";
> >  		};
> >  	};
> >  
> > -	led-rgb {
> > +	led-controller-2 {
> 
> Is a single RGB LED really a controller?

I just followed the recommendations by Rob here. 

> >  		compatible = "pwm-leds";
> >  
> > -		led-red {
> > +		led-2 {
> 
> Shouldn't this have been led-1 as well or is the numbering "global" ?

Also good question. This numbering is for dts only, it usually does
not correspond with LEDs on the board, so it could be numbered per
led-controller as well?

Greets
Alex

> 
> >  			label = "mc1:red:rgb";
> >  			pwms = <&leds_pwm 1 1000000 0>;
> >  			max-brightness = <255>;
> >  			active-low;
> >  		};
> >  
> > -		led-green {
> > +		led-3 {
> >  			label = "mc1:green:rgb";
> >  			pwms = <&leds_pwm 2 1000000 0>;
> >  			max-brightness = <255>;
> >  			active-low;
> >  		};
> >  
> > -		led-blue {
> > +		led-4 {
> >  			label = "mc1:blue:rgb";
> >  			pwms = <&leds_pwm 3 1000000 0>;
> >  			max-brightness = <255>;
> > 
> 
> -- 
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