linux-kernel - Re: [PATCH 1/3] dt-bindings: dma: arm-dma350: update DT binding docs

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Message-ID: <7df26091-97be-4494-8140-5e2ca54780ea@kernel.org>
Date: Mon, 17 Nov 2025 14:29:02 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jun Guo <jun.guo@...tech.com>, peter.chen@...tech.com,
 fugang.duan@...tech.com, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, vkoul@...nel.org, ychuang3@...oton.com,
 schung@...oton.com, robin.murphy@....com
Cc: dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, cix-kernel-upstream@...tech.com,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] dt-bindings: dma: arm-dma350: update DT binding docs

On 17/11/2025 13:51, Jun Guo wrote:
> 
> On 11/17/2025 3:13 PM, Krzysztof Kozlowski wrote:
>> EXTERNAL EMAIL
>>
>> On 17/11/2025 08:11, Krzysztof Kozlowski wrote:
>>> On 17/11/2025 08:07, Jun Guo wrote:
>>>>
>>>> On 11/17/2025 2:11 PM, Krzysztof Kozlowski wrote:
>>>>> On 17/11/2025 02:59, Jun Guo wrote:
>>>>>> - Add new compatible strings to the DT binding documents to support
>>>>> This is not a list.
>>>>>
>>>>> Also, subject is completely redundant. Everything is an update. Why are
>>>>> you repeating DT binding docs?
>>>>>
>>>> Thank you. I will incorporate your feedback in the next version.>>   cix
>>>> sky1 SoC.
>>>>>>
>>>>>> Signed-off-by: Jun Guo<jun.guo@...tech.com>
>>>>>> ---
>>>>> You just broke all existing platforms. Please test your code properly.
>>>> The patch includes proper checks. Since this platform is the first user
>>>
>>> Nah, tests are here incomplete - look at the binding and DTS users...
>>> nothing there, so you cannot test it.
>>>
>>>> of the driver in the current codebase, the change won't affect other
>>>> platforms.
>>>
>>> NAK, and you keep pushing... I just told you it will break everyone,
>>> which is obvious from the diff.
>>
>> But if that was intentional change of ABI, then could be fine, but you
>> must provide in commit msg proper detailed rationale WHY you are
>> changing ABI and WHAT is the ABI impact of that change.
>>
> I'm not entirely sure if I fully grasped your point, but I also 
> identified the potential issue. I've reworked the patch to accommodate 
> both the default DTS case with a single compatible string and the 
> scenario where platform-specific compatible strings need to be added. 
> Could you please review it again and confirm if this aligns with your 
> intent?
> 
> properties:
>    compatible:
>      contains:

Which example uses such syntax?

>        enum:
>          - cix,sky1-dma-350
>          - arm,dma-350

It's completely different than previous, so I don't know what you want
to achieve, but maybe you wanted to explain lack of compatibility in the
commit msg. Anyway, send proper patches with proper justification (and
for above would really need to be proper).

Best regards,
Krzysztof