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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f6ed201d-51b6-f278-7a95-3e3e49dc19ee@pengutronix.de>
Date:   Tue, 27 Oct 2020 11:58:10 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     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,

On 10/27/20 11:05 AM, Alexander Dahl wrote:
> Hello Ahmad,
> 
> thanks for your feedback, comments below.
> 

>>> -	led-rgb {
>>> +	led-controller-2 {
>>
>> Is a single RGB LED really a controller?
> 
> I just followed the recommendations by Rob here.

Do you happen to know if the new multicolor LED support could be used here?

I find it unfortunate that the device tree loses information relevant to humans
to adhere to a fixed nomenclature. Apparently led-controller isn't even codified
in the YAML binding (It's just in the examples). If you respin, please add a
comment that this is a single RGB led. I'd prefer to keep the information
in the DTB as well though.



> 
>>>  		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?

I'd prefer that it starts by 1. That way it's aligned with PWM channel
ID.

Thanks for fixing the dtschema warnings by the way!

Cheers,
Ahmad

> 
> 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>;
>>>
>>
>> -- 
>> Pengutronix e.K.                           |                             |
>> Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
>> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
>> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
> 

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |