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 08:03:40 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Alexander Dahl <post@...pocky.de>, Pavel Machek <pavel@....cz>,
        Dan Murphy <dmurphy@...com>, Rob Herring <robh+dt@...nel.org>
Cc:     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 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?

>  		compatible = "pwm-leds";
>  
> -		led-red {
> +		led-2 {

Shouldn't this have been led-1 as well or is the numbering "global" ?

>  			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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