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

From: Alexandre Torgue <alexandre.torgue@st.com>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>,
	<linux-arm-kernel@lists.infradead.org>,
	<devicetree@vger.kernel.org>, Alexander Dahl <ada@thorsis.com>,
	<linux-kernel@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>
Subject: Re: [Linux-stm32] [PATCH v7 10/12] ARM: dts: stm32: Fix schema warnings for pwm-leds
Date: Mon, 9 Nov 2020 12:02:18 +0100	[thread overview]
Message-ID: <eef76d72-7467-eed7-ac65-93237bd2b3bb@st.com> (raw)
In-Reply-To: <20201031135408.lgpiy5goa7l4cg2k@falbala.internal.home.lespocky.de>

Hi Alex

On 10/31/20 2:54 PM, Alexander Dahl wrote:
> Hei hei,
> 
> On Tue, Oct 27, 2020 at 11:58:10AM +0100, Ahmad Fatoum wrote:
>> 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.
> 
> Slightly off-topic, but while I was working on the patch based on your
> feedback I tried to find some information on that Linux Automation
> MC-1 board.  However I could not find any? Is there some website, some
> datasheet or maybe a schematic online?  The vendor prefix says "Linux
> Automation GmbH", but I find only that USB-SD-Mux on their page?
> 
> Greets
> Alex

I saw that Ahmad Acked this patch but regarding your discussion it seems 
there are opening questions. Are you going to send an update of it or 
can I take it ?

regards
alex

> 
>>
>>
>>
>>>
>>>>>   		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 |
> 
> 
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