linux-kernel - Re: [PATCH 1/5] dt-bindings: firmware: scm: Add QDU1000/QRU1000 compatibles

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Date:   Tue, 4 Oct 2022 08:53:50 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Melody Olvera <quic_molvera@...cinc.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] dt-bindings: firmware: scm: Add QDU1000/QRU1000
 compatibles

On 04/10/2022 00:14, Dmitry Baryshkov wrote:
> On Tue, 4 Oct 2022 at 01:02, Melody Olvera <quic_molvera@...cinc.com> wrote:
>>
>>
>> On 10/1/2022 4:25 AM, Krzysztof Kozlowski wrote:
>>> On 01/10/2022 05:06, Melody Olvera wrote:
>>>> Add compatibles for scm driver for QDU1000 and QRU1000 platforms.
>>>>
>>>> Signed-off-by: Melody Olvera <quic_molvera@...cinc.com>
>>>> ---
>>>>  Documentation/devicetree/bindings/firmware/qcom,scm.yaml | 2 ++
>>>>  1 file changed, 2 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
>>>> index c5b76c9f7ad0..b47a5dda3c3e 100644
>>>> --- a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
>>>> +++ b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
>>>> @@ -51,6 +51,8 @@ properties:
>>>>            - qcom,scm-sm8250
>>>>            - qcom,scm-sm8350
>>>>            - qcom,scm-sm8450
>>>> +          - qcom,scm-qdu1000
>>>> +          - qcom,scm-qru1000
> 
> I think after seeing all the patchsets it's time to ask the following
> question. Do we really need a duplicate compatibility families:
> qdu1000 vs qru1000? I'd suggest using a single set of compatibile
> strings in most of the cases.
> Settle down onto a single name (qdu,qru, qdru, whatever) and define
> distinct compat strings only when there is an actual difference?
> 
> E.g .we don't have separate compatible strings for all the sda660,
> apq8096, etc. unless this is required by the corresponding hardware
> block not being compatible with corresponding sdm or msm counterpart.
> 

I am not that fluent in Qualcomm naming, so let me ask - what are the
differences between QDU and QRU?

For compatible (and/or similar) devices the general recommendation is to
have specific compatibles followed by fallback. Even if devices are
very, very, very similar, usually the recommendation still stays.

Best regards,
Krzysztof