linux-kernel - Re: [PATCH v3 1/2] dt-bindings: soc: qcom: Add qcom,kaanapali-imem compatible

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Message-ID: <8f6189b0-24ac-4e24-9db5-c6f4d1bfb26a@kernel.org>
Date: Tue, 4 Nov 2025 16:02:27 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Jingyi Wang <jingyi.wang@....qualcomm.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Robert Marko <robimarko@...il.com>,
 Das Srinagesh <quic_gurus@...cinc.com>, aiqun.yu@....qualcomm.com,
 tingwei.zhang@....qualcomm.com, trilok.soni@....qualcomm.com,
 yijie.yang@....qualcomm.com, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: soc: qcom: Add qcom,kaanapali-imem
 compatible

On 04/11/2025 15:58, Konrad Dybcio wrote:
> On 11/4/25 3:52 PM, Krzysztof Kozlowski wrote:
>> On 04/11/2025 15:38, Konrad Dybcio wrote:
>>> On 11/4/25 3:37 PM, Krzysztof Kozlowski wrote:
>>>> On 04/11/2025 15:35, Konrad Dybcio wrote:
>>>>> On 11/4/25 3:26 PM, Krzysztof Kozlowski wrote:
>>>>>> This I got, but nothing here explains why you need generic compatible.
>>>>>> To re-iterate: there was no generic compatible before, now there is.
>>>>>> Writing bindings and numerous reviews from DT maintainers ask not to use
>>>>>> generic compatibles.
>>>>>
>>>>> OK so let's not worry about a generic compatible. IMEM exists since
>>>>> MSM8974 and it only had major hw updates with SM8550. They don't
>>>>> impact the software interface though, so qcom,msm8974-imem is OK.
>>>>>
>>>>> There's a separate control/status register address space for each
>>>>> instance of this IP (usually far apart from the actual SRAM pool),
>>>>> which Linux doesn't have to care about.
>>>>
>>>> Just use qcom,kaanapali-imem - that's the first device here without syscons.
>>>
>>> So we don't want to move the existing ones over?
>>
>> This was never discussed and this patch did not do it. You cannot move
>> them, that's ABI.
> 
> I see, I implicitly assumed this would be a sweeping change.
> 
> So should the Kaanapali submitters simply send a version of this
> patch with:
> 
> - oneOf:
>   - const: qcom,kaanapali-imem
>   - items:
>     # existing big list
> 
> ?
> 
> I'm not a huge fan of using kaanapali as the fallback-going-forward
> since it's literally the newest platform on the shelves (or perhaps
> not even on the shelves yet..) so it's going to look funny when
> someone comes up with support for another 2013 soc.. but perhaps
> that's just how things are supposed to be


Yes. Feel free to choose other fully compatible device as the fallback,
like you mentioned in previous email, I proposed Kaanapali as the easiest.

Best regards,
Krzysztof