linux-kernel - Re: [PATCH v2 1/2] dt-bindings: soc: qcom: Add RPM Master stats

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Date:   Wed, 12 Apr 2023 09:22:32 -0500
From:   Rob Herring <robh@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: soc: qcom: Add RPM Master stats

On Thu, Apr 06, 2023 at 04:49:17PM +0200, Konrad Dybcio wrote:
> The RPM MSG RAM contains per-RPM-master (e.g. APPS, ADSP etc.) sleep
> statistics. They let one assess which core is actively preventing the
> system from entering a true low-power mode.

Just curious, is that a debug thing or something the OS uses?

> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  .../bindings/soc/qcom/rpm-master-stats.yaml        | 53 ++++++++++++++++++++++

qcom,rpm-master-stats.yaml

>  1 file changed, 53 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/rpm-master-stats.yaml b/Documentation/devicetree/bindings/soc/qcom/rpm-master-stats.yaml
> new file mode 100644
> index 000000000000..d2d6a2a39fef
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/rpm-master-stats.yaml
> @@ -0,0 +1,53 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/qcom/rpm-master-stats.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Technologies, Inc. (QTI) RPM Master Stats
> +
> +maintainers:
> +  - Konrad Dybcio <konrad.dybcio@...aro.org>
> +
> +description:
> +  Per-RPM-Master (e.g. APSS, ADSP, etc.) sleep statistics.
> +
> +properties:
> +  compatible:
> +    const: qcom,rpm-master-stats
> +
> +  qcom,rpm-msg-ram:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description: Phandle to an RPM MSG RAM slice containing the master stats
> +    minItems: 1
> +    maxItems: 5
> +
> +  qcom,master-names:
> +    $ref: /schemas/types.yaml#/definitions/string-array
> +    description: RPM Master name
> +    minItems: 1
> +    maxItems: 5
> +
> +required:
> +  - compatible
> +  - qcom,rpm-msg-ram
> +  - qcom,master-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    stats {
> +      compatible = "qcom,rpm-master-stats";
> +      qcom,rpm-msg-ram = <&apss_master_stats>,
> +                         <&mpss_master_stats>,
> +                         <&adsp_master_stats>,
> +                         <&cdsp_master_stats>,
> +                         <&tz_master_stats>;
> +      qcom,master-names = "APSS",
> +                          "MPSS",
> +                          "ADSP",
> +                          "CDSP",
> +                          "TZ";
> +    };
> +...
> 
> -- 
> 2.40.0
>