linux-kernel - Re: [PATCH v2 00/13] mailbox/arm64/ qcom: rework compatibles for fallback

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Date:   Tue, 14 Mar 2023 14:16:54 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 00/13] mailbox/arm64/ qcom: rework compatibles for
 fallback

On 14/03/2023 10:09, Krzysztof Kozlowski wrote:
> Hi,
> 
> Changes since v1
> ================
> 1. Rebase
> 2. Make msm8994 fallback for several variants, not msm8953, because the latter
>     actually might take some clocks.

Although the approach looks correct, I think that in some cases it tries 
to mark devices compatible judging from the current driver, not from the 
hardware itself.

For the reference, on msm8994 the apcs is a clock controller for the l2 
clocks (which we do not support yet). If I'm not mistaken, on msm8976 
the apcs region contains a mux for the cluster1 clocks. On sdm630/660 
the apcs region also seems to be involved in CPU clocks scaling.

On the other hand, the sc7180/sm8150 part seems logical.

> 3. Two new patches for SDX55.
> 4. Minor corrections in bindings style.
> v1: https://lore.kernel.org/all/20230202161856.385825-1-krzysztof.kozlowski@linaro.org/
> 
> Description
> ===========
> 
> If entire approach is accepted (and correct), there are no dependencies and
> patches can be picked independently.  Although the best in the same cycle, so
> there will be no new `dtbs_check` warnings.
> 
> Best regards,
> Krzysztof
> 
> Krzysztof Kozlowski (13):
>    dt-bindings: mailbox: qcom,apcs-kpss-global: correct SDX55 clocks
>    dt-bindings: mailbox: qcom,apcs-kpss-global: fix SDX55 'if' match
>    dt-bindings: mailbox: qcom,apcs-kpss-global: use fallbacks
>    mailbox: qcom-apcs-ipc: do not grow the of_device_id
>    arm64: dts: qcom: ipq8074: add compatible fallback to mailbox
>    arm64: dts: qcom: msm8976: add compatible fallback to mailbox
>    arm64: dts: qcom: msm8998: add compatible fallback to mailbox
>    arm64: dts: qcom: sdm630: add compatible fallback to mailbox
>    arm64: dts: qcom: sm6115: add compatible fallback to mailbox
>    arm64: dts: qcom: sm6125: add compatible fallback to mailbox
>    arm64: dts: qcom: qcs404: add compatible fallback to mailbox
>    arm64: dts: qcom: sc7180: add compatible fallback to mailbox
>    arm64: dts: qcom: sm8150: add compatible fallback to mailbox
> 
>   .../mailbox/qcom,apcs-kpss-global.yaml        | 67 ++++++++++---------
>   arch/arm64/boot/dts/qcom/ipq8074.dtsi         |  3 +-
>   arch/arm64/boot/dts/qcom/msm8976.dtsi         |  3 +-
>   arch/arm64/boot/dts/qcom/msm8998.dtsi         |  3 +-
>   arch/arm64/boot/dts/qcom/qcs404.dtsi          |  3 +-
>   arch/arm64/boot/dts/qcom/sc7180.dtsi          |  3 +-
>   arch/arm64/boot/dts/qcom/sdm630.dtsi          |  3 +-
>   arch/arm64/boot/dts/qcom/sm6115.dtsi          |  3 +-
>   arch/arm64/boot/dts/qcom/sm6125.dtsi          |  3 +-
>   arch/arm64/boot/dts/qcom/sm8150.dtsi          |  3 +-
>   drivers/mailbox/qcom-apcs-ipc-mailbox.c       | 11 +--
>   11 files changed, 60 insertions(+), 45 deletions(-)
> 

-- 
With best wishes
Dmitry