linux-kernel - Re: [PATCH v11 1/2] dt-bindings: memory: mediatek: Add SMI reset and clamp for MT8188

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Message-ID: <008ce91a-9037-4f18-9639-f1ccda277624@kernel.org>
Date: Fri, 31 Oct 2025 13:07:51 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Friday Yang (杨阳) <Friday.Yang@...iatek.com>,
 "robh@...nel.org" <robh@...nel.org>,
 "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
 Yong Wu (吴勇) <Yong.Wu@...iatek.com>,
 "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
 "conor+dt@...nel.org" <conor+dt@...nel.org>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 Project_Global_Chrome_Upstream_Group
 <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v11 1/2] dt-bindings: memory: mediatek: Add SMI reset and
 clamp for MT8188

On 31/10/2025 07:10, Friday Yang (杨阳) wrote:
> On Sat, 2025-10-18 at 18:42 +0200, Krzysztof Kozlowski wrote:
>> External email : Please do not click links or open attachments until
>> you have verified the sender or the content.
>>
>>
>> On 17/09/2025 14:07, Friday Yang wrote:
>>> Add 'resets' and 'reset-names' properties for SMI LARBs to support
>>> SMI reset operations.
>>
>> Not informative...
>>
>>> diff --git a/Documentation/devicetree/bindings/memory-
>>> controllers/mediatek,smi-larb.yaml
>>> b/Documentation/devicetree/bindings/memory-
>>> controllers/mediatek,smi-larb.yaml
>>> index 2e7fac4b5094..fc5feb2eac1f 100644
>>> --- a/Documentation/devicetree/bindings/memory-
>>> controllers/mediatek,smi-larb.yaml
>>> +++ b/Documentation/devicetree/bindings/memory-
>>> controllers/mediatek,smi-larb.yaml
>>> @@ -70,6 +70,12 @@ properties:
>>>      description: the hardware id of this larb. It's only required
>>> when this
>>>        hardware id is not consecutive from its M4U point of view.
>>>
>>> +  resets:
>>> +    maxItems: 1
>>> +
>>> +  reset-names:
>>> +    const: larb
>>
>> Is the reset valid for all existing devices as well? Commit msg does
>> not
>> explain that... it is pretty useless - you say what you did. We see
>> that
>> from the diff. Explain something not obvious.
>>
> 
> Thanks, I could add more descriptions here, like below:
> 
> On the MediaTek MT8188 SoC, bus glitches may occur during MTCMOS
> on/off transitions. To prevent these glitches from causing errors,
> SMI requires clamp and reset operations. This issue specifically
> affects the image, camera, and IPE subsystems. 

This explains why you need it. But I asked more questions than only "whY".

Read the question:
"Is the reset valid for all existing devices as well?"
Where is the answer for that? I still do not know...

Do not reply to only pieces of review.

> This change adds the
> 'resets' and 'reset-names' properties to the SMI LARBs within
> these subsystems to support the necessary reset operations.

Read again my message:
" it is pretty useless - you say what you did"
That's the same, drop.

So again you just cared to implement only piece of review.

Best regards,
Krzysztof