linux-kernel - Re: [PATCH v3 6/7] dt-bindings: soc: qcom: Extend RPMh power controller binding to describe thermal warming device

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Message-ID: <CAPDyKFqcKfmnNJ7j4Jb+JH739FBcHg5NBD6aR4H_N=zWGwm1ww@mail.gmail.com>
Date:   Thu, 17 Oct 2019 11:04:07 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Thara Gopinath <thara.gopinath@...aro.org>
Cc:     Eduardo Valentin <edubezval@...il.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>, amit.kucheria@...durent.com,
        Mark Rutland <mark.rutland@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 6/7] dt-bindings: soc: qcom: Extend RPMh power
 controller binding to describe thermal warming device

On Wed, 16 Oct 2019 at 21:37, Thara Gopinath <thara.gopinath@...aro.org> wrote:
>
> RPMh power controller hosts mx domain that can be used as thermal
> warming device. Add a sub-node to specify this.
>
> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
> ---
>  Documentation/devicetree/bindings/power/qcom,rpmpd.txt | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/power/qcom,rpmpd.txt b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
> index eb35b22..fff695d 100644
> --- a/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
> +++ b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
> @@ -18,6 +18,16 @@ Required Properties:
>  Refer to <dt-bindings/power/qcom-rpmpd.h> for the level values for
>  various OPPs for different platforms as well as Power domain indexes
>
> += SUBNODES
> +RPMh alsp hosts power domains that can behave as thermal warming device.
> +These are expressed as subnodes of the RPMh. The name of the node is used
> +to identify the power domain and must therefor be "mx".
> +
> +- #cooling-cells:
> +       Usage: optional
> +       Value type: <u32>
> +       Definition: must be 2
> +

Just wanted to express a minor thought about this. In general we use
subnodes of PM domain providers to represent the topology of PM
domains (subdomains), this is something different, which I guess is
fine.

I assume the #cooling-cells is here tells us this is not a PM domain
provider, but a "cooling device provider"?

Also, I wonder if it would be fine to specify "power-domains" here,
rather than using "name" as I think that is kind of awkward!?

>  Example: rpmh power domain controller and OPP table
>
>  #include <dt-bindings/power/qcom-rpmhpd.h>
> --
> 2.1.4
>

Kind regards
Uffe