linux-kernel - Re: [PATCH v7 1/3] dt-bindings: arm: qcom: document qcom,msm-id and qcom,board-id

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Message-ID: <fe747000-a650-ed2f-8581-92b044f86f2f@linaro.org>
Date:   Mon, 26 Sep 2022 12:30:38 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Kumar Gala <galak@...eaurora.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v7 1/3] dt-bindings: arm: qcom: document qcom,msm-id and
 qcom,board-id

On 30/08/2022 08:57, Krzysztof Kozlowski wrote:
> The top level qcom,msm-id and qcom,board-id properties are utilized by
> bootloaders on Qualcomm MSM platforms to determine which device tree
> should be used and passed to the kernel.
> 
> The commit b32e592d3c28 ("devicetree: bindings: Document qcom board
> compatible format") from 2015 was a consensus during discussion about
> upstreaming qcom,msm-id and qcom,board-id fields.  There are however still
> problems with that consensus:
> 1. It was reached 7 years ago but it turned out its implementation did
>    not reach all possible products.
> 
> 2. Initially additional tool (dtbTool) was needed for parsing these
>    fields to create a QCDT image consisting of multiple DTBs, later the
>    bootloaders were improved and they use these qcom,msm-id and
>    qcom,board-id properties directly.
> 
> 3. Extracting relevant information from the board compatible requires
>    this additional tool (dtbTool), which makes the build process more
>    complicated and not easily reproducible (DTBs are modified after the
>    kernel build).
> 
> 4. Some versions of Qualcomm bootloaders expect these properties even
>    when booting with a single DTB.  The community is stuck with these
>    bootloaders thus they require properties in the DTBs.
> 
> Since several upstreamed Qualcomm SoC-based boards require these
> properties to properly boot and the properties are reportedly used by
> bootloaders, document them along with the bindings header with constants
> used by: bootloader, some DTS and socinfo driver.
> 
> Link: https://lore.kernel.org/r/a3c932d1-a102-ce18-deea-18cbbd05ecab@linaro.org/
> Co-developed-by: Kumar Gala <galak@...eaurora.org>
> Signed-off-by: Kumar Gala <galak@...eaurora.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Reviewed-by: Rob Herring <robh@...nel.org>
> 
> ---
> 
> Changes since v6:
> 1. Update header with defines
> 2. Add Rb tag

Hi Bjorn,

Any further comments on this? Can it be applied?

Best regards,
Krzysztof