linux-kernel - Re: [PATCH 06/13] arm64: dts: mediatek: mt8188: Update VPPSYS node name and compatible

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Message-ID: <64cc35c8-30df-4882-a933-f42119270f48@kernel.org>
Date: Tue, 10 Sep 2024 09:18:51 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Fei Shao <fshao@...omium.org>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Matthias Brugger <matthias.bgg@...il.com>, Conor Dooley
 <conor+dt@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 06/13] arm64: dts: mediatek: mt8188: Update VPPSYS node
 name and compatible

On 10/09/2024 07:12, Fei Shao wrote:
> On Mon, Sep 9, 2024 at 7:41 PM Krzysztof Kozlowski <krzk@...nel.org> wrote:
>>
>> On 09/09/2024 13:14, Fei Shao wrote:
>>> Use and add "syscon" in VPPSYS node names and compatible to fix errors
>>> from `make CHECK_DTBS=y mediatek/mt8188-evb.dtb`.
>>>
>>> Signed-off-by: Fei Shao <fshao@...omium.org>
>>> ---
>>>
>>>  arch/arm64/boot/dts/mediatek/mt8188.dtsi | 8 ++++----
>>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/mediatek/mt8188.dtsi b/arch/arm64/boot/dts/mediatek/mt8188.dtsi
>>> index 2900d78b7ceb..14e51a11f688 100644
>>> --- a/arch/arm64/boot/dts/mediatek/mt8188.dtsi
>>> +++ b/arch/arm64/boot/dts/mediatek/mt8188.dtsi
>>> @@ -1799,8 +1799,8 @@ mfgcfg: clock-controller@...bf000 {
>>>                       #clock-cells = <1>;
>>>               };
>>>
>>> -             vppsys0: clock-controller@...00000 {
>>> -                     compatible = "mediatek,mt8188-vppsys0";
>>> +             vppsys0: syscon@...00000 {
>>> +                     compatible = "mediatek,mt8188-vppsys0", "syscon";
>>
>> If this was working before, it looks like this is not a syscon and
>> bindings need to be fixed.
> 
> I guess it's because the binding was later updated in commit
> 26bcd8a53098 ("dt-bindings: arm: mediatek: mmsys: Add VPPSYS
> compatible for MT8188"), and the corresponding DT update was unnoticed
> at the time.
> If that makes sense then this should be a valid fix.

Not necessarily. Why not fixing bindings? Prove that bindings are
correct, not DTS, first.

Best regards,
Krzysztof