linux-kernel - Re: [PATCH 1/2] dt-bindings: pwm: mediatek,mt2712: add compatible for MT7988

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Date: Wed, 14 Feb 2024 07:34:40 +0100
From: Rafał Miłecki <zajec5@...il.com>
To: Conor Dooley <conor@...nel.org>
Cc: Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 John Crispin <john@...ozen.org>, linux-pwm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH 1/2] dt-bindings: pwm: mediatek,mt2712: add compatible for
 MT7988

On 13.02.2024 19:18, Conor Dooley wrote:
> On Tue, Feb 13, 2024 at 05:46:32PM +0100, Rafał Miłecki wrote:
>> From: Rafał Miłecki <rafal@...ecki.pl>
>>
>> MT7988 has on-SoC controller that can control up to 8 PWMs.
> 
> I see a binding and a dts patch, but no driver patch, how come?

I believe that to avoid cross-trees patchsets (which are sometimes
tricky for maintainers) there are two ways of submiting such changes:
1. dt-binding + driver; then (separately) DTS
2. dt-binding + DTS; then (separately) driver

I chose later in this case as my personal priority right now is to deal
with all MediaTek DTS files.

Is that wrong or unacceptable?


> Also, what makes this incompatibly different with the other devices in
> the binding, like the 8183?

It can control 8 PWMs unlike any other SoC block except for MT2712.
It uses different registers than MT2712 thought.


> Cheers,
> Conor.
> 
>>
>> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
>> ---
>>   Documentation/devicetree/bindings/pwm/mediatek,mt2712-pwm.yaml | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/Documentation/devicetree/bindings/pwm/mediatek,mt2712-pwm.yaml b/Documentation/devicetree/bindings/pwm/mediatek,mt2712-pwm.yaml
>> index 0fbe8a6469eb..a5c308801619 100644
>> --- a/Documentation/devicetree/bindings/pwm/mediatek,mt2712-pwm.yaml
>> +++ b/Documentation/devicetree/bindings/pwm/mediatek,mt2712-pwm.yaml
>> @@ -24,6 +24,7 @@ properties:
>>             - mediatek,mt7629-pwm
>>             - mediatek,mt7981-pwm
>>             - mediatek,mt7986-pwm
>> +          - mediatek,mt7988-pwm
>>             - mediatek,mt8183-pwm
>>             - mediatek,mt8365-pwm
>>             - mediatek,mt8516-pwm
>> -- 
>> 2.35.3
>>