linux-kernel - Re: [PATCH 01/27] dt-bindings: pwm: Add compatible for MediaTek MT6795

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Date:   Fri, 14 Apr 2023 10:34:47 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, matthias.bgg@...il.com,
        p.zabel@...gutronix.de, airlied@...il.com, daniel@...ll.ch,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        jassisinghbrar@...il.com, chunfeng.yun@...iatek.com,
        vkoul@...nel.org, kishon@...nel.org, thierry.reding@...il.com,
        chunkuang.hu@...nel.org, ck.hu@...iatek.com,
        jitao.shi@...iatek.com, xinlei.lee@...iatek.com,
        houlong.wei@...iatek.com, dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-phy@...ts.infradead.org, linux-pwm@...r.kernel.org,
        kernel@...labora.com, phone-devel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH 01/27] dt-bindings: pwm: Add compatible for MediaTek
 MT6795

On 14/04/2023 10:30, Uwe Kleine-König wrote:
> On Fri, Apr 14, 2023 at 10:21:05AM +0200, Krzysztof Kozlowski wrote:
>> On 12/04/2023 13:27, AngeloGioacchino Del Regno wrote:
>>> Add a compatible string for MediaTek Helio X10 MT6795's display PWM
>>> block: this is the same as MT8173.
>>>
>>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>>> ---
>>>  Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml | 4 +++-
>>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml b/Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml
>>> index 0088bc8e7c54..153e146df7d4 100644
>>> --- a/Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml
>>> +++ b/Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml
>>> @@ -22,7 +22,9 @@ properties:
>>>            - mediatek,mt8173-disp-pwm
>>>            - mediatek,mt8183-disp-pwm
>>>        - items:
>>> -          - const: mediatek,mt8167-disp-pwm
>>> +          - enum:
>>> +              - mediatek,mt6795-disp-pwm
>>> +              - mediatek,mt8167-disp-pwm
>>
>> This does not look correct. You do not add compatible, you replace
>> breaking all mt8167-disp-pwm. At least it looks like this from context.
> 
> I thought the old semantic to be:
> 
> 	"mediatek,mt8167-disp-pwm"
> 
> and the new
> 
> 	"mediatek,mt6795-disp-pwm" or "mediatek,mt8167-disp-pwm"
> 
> . What am I missing?

The new is ok for mt6795 but it is not valid for mt8167.

Best regards,
Krzysztof