linux-kernel - Re: [PATCH V6 1/3] dt-bindings: sram: qcom,imem: Add Boot Stat region within IMEM

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Date:   Tue, 9 May 2023 14:35:39 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Souradeep Chowdhury <quic_schowdhu@...cinc.com>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Sibi Sankar <quic_sibis@...cinc.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>
Subject: Re: [PATCH V6 1/3] dt-bindings: sram: qcom,imem: Add Boot Stat region
 within IMEM

On Tue, 9 May 2023 at 13:53, Souradeep Chowdhury
<quic_schowdhu@...cinc.com> wrote:
>
> All Qualcomm bootloaders log useful timestamp information related
> to bootloader stats in the IMEM region. Add the child node within
> IMEM for the boot stat region containing register address and
> compatible string.

I might have a minor vote here. Is there any reason why you have to
instantiate the device from DT?
It looks like a software interface. Ideally software should not be
described in DT (e.g. this can be instantiated from imem
driver-to-be).
Or we can follow the RPM master-stats approach, where the device is a
top-level device, having handle pointers to the sram regions.

>
> Signed-off-by: Souradeep Chowdhury <quic_schowdhu@...cinc.com>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  .../devicetree/bindings/sram/qcom,imem.yaml   | 22 +++++++++++++++++++
>  1 file changed, 22 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/sram/qcom,imem.yaml b/Documentation/devicetree/bindings/sram/qcom,imem.yaml
> index 0548e8e0d30b..bb884c5c8952 100644
> --- a/Documentation/devicetree/bindings/sram/qcom,imem.yaml
> +++ b/Documentation/devicetree/bindings/sram/qcom,imem.yaml
> @@ -50,6 +50,28 @@ patternProperties:
>      $ref: /schemas/remoteproc/qcom,pil-info.yaml#
>      description: Peripheral image loader relocation region
>
> +  "^stats@[0-9a-f]+$":
> +    type: object
> +    description:
> +      Imem region dedicated for storing timestamps related
> +      information regarding bootstats.
> +
> +    additionalProperties: false
> +
> +    properties:
> +      compatible:
> +        items:
> +          - enum:
> +              - qcom,sm8450-bootstats
> +          - const: qcom,imem-bootstats
> +
> +      reg:
> +        maxItems: 1
> +
> +    required:
> +      - compatible
> +      - reg
> +
>  required:
>    - compatible
>    - reg
> --
> 2.17.1
>


-- 
With best wishes
Dmitry