linux-kernel - Re: [PATCH v6 1/4] dt-bindings: Introduce SoC sleep stats bindings

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Date:   Mon, 08 Feb 2021 16:23:32 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Maulik Shah <mkshah@...eaurora.org>, bjorn.andersson@...aro.org,
        evgreen@...omium.org, mka@...omium.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        agross@...nel.org, dianders@...omium.org, linux@...ck-us.net,
        rnayak@...eaurora.org, ilina@...eaurora.org, lsrao@...eaurora.org,
        Mahesh Sivasubramanian <msivasub@...eaurora.org>,
        devicetree@...r.kernel.org, Maulik Shah <mkshah@...eaurora.org>
Subject: Re: [PATCH v6 1/4] dt-bindings: Introduce SoC sleep stats bindings

Quoting Maulik Shah (2021-02-04 06:21:45)
> +
> +description:
> +  Always On Processor/Resource Power Manager maintains statistics of the SoC
> +  sleep modes involving powering down of the rails and oscillator clock.
> +
> +  Statistics includes SoC sleep mode type, number of times low power mode were
> +  entered, time of last entry, time of last exit and accumulated sleep duration.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,rpmh-sleep-stats
> +      - qcom,rpm-sleep-stats
> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +examples:
> +  # Example of rpmh sleep stats
> +  - |
> +    rpmh-sleep-stats@...0000 {
> +      compatible = "qcom,rpmh-sleep-stats";
> +      reg = <0 0x0c3f0000 0 0x400>;
> +    };

Maybe it should just be another reg property of the rpmh or rpm node?
Then the rpmh driver can create the stats "device" at driver probe time,
or just roll it into the same thing. It looks pretty weird to have a
device in DT for this given that it's not really hardware, more like a
place that the processor writes some stuff about what's going on in the
SoC related to power management. 

> +  # Example of rpm sleep stats
> +  - |
> +    rpm-sleep-stats@...0000 {
> +      compatible = "qcom,rpm-sleep-stats";
> +      reg = <0 0x04690000 0 0x400>;
> +    };
> +...