linux-kernel - Re: [PATCH v1 4/7] dt-bindings: devfreq: tegra30-actmon: Add cooling-cells

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Date:   Thu, 20 May 2021 11:49:29 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Rob Herring <robh+dt@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Peter Geis <pgwipeout@...il.com>,
        Matt Merhar <mattmerhar@...tonmail.com>
Cc:     linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 4/7] dt-bindings: devfreq: tegra30-actmon: Add
 cooling-cells

On 5/11/21 6:10 AM, Dmitry Osipenko wrote:
> The ACTMON watches activity of memory clients. Decisions about a minimum
> required frequency are made based on the info from ACTMON. We can use
> ACTMON as a thermal cooling device by limiting the required frequency.
> Document new cooling-cells property of NVIDIA Tegra ACTMON hardware unit.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  .../devicetree/bindings/devfreq/nvidia,tegra30-actmon.yaml   | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/devfreq/nvidia,tegra30-actmon.yaml b/Documentation/devicetree/bindings/devfreq/nvidia,tegra30-actmon.yaml
> index 2a940d5d7ab4..0aa9459b7751 100644
> --- a/Documentation/devicetree/bindings/devfreq/nvidia,tegra30-actmon.yaml
> +++ b/Documentation/devicetree/bindings/devfreq/nvidia,tegra30-actmon.yaml
> @@ -63,6 +63,9 @@ properties:
>        Should contain freqs and voltages and opp-supported-hw property, which
>        is a bitfield indicating SoC speedo ID mask.
>  
> +  "#cooling-cells":
> +    const: 2
> +
>  required:
>    - compatible
>    - reg
> @@ -74,6 +77,7 @@ required:
>    - interconnects
>    - interconnect-names
>    - operating-points-v2
> +  - "#cooling-cells"
>  
>  additionalProperties: false
>  
> @@ -118,4 +122,5 @@ examples:
>          operating-points-v2 = <&dvfs_opp_table>;
>          interconnects = <&mc TEGRA30_MC_MPCORER &emc>;
>          interconnect-names = "cpu-read";
> +        #cooling-cells = <2>;
>      };
> 

Acked-by: Chanwoo Choi <cw00.choi@...sung.com>

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics