linux-kernel - Re: [PATCH 1/4] dt-bindings: opp: Introduce opp-sustainable bindings

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Message-ID: <20201030193427.GA4186428@bogus>
Date:   Fri, 30 Oct 2020 14:34:27 -0500
From:   Rob Herring <robh@...nel.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        vireshk@...nel.org, sboyd@...nel.org, nm@...com, rafael@...nel.org,
        sudeep.holla@....com, daniel.lezcano@...aro.org,
        Dietmar.Eggemann@....com
Subject: Re: [PATCH 1/4] dt-bindings: opp: Introduce opp-sustainable bindings

On Wed, Oct 28, 2020 at 02:08:44PM +0000, Lukasz Luba wrote:
> Add opp-sustainable as an additional property in the OPP node to describe
> the sustainable performance level of the device. This will help to
> estimate the sustainable performance of the whole system.
> 
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---
>  Documentation/devicetree/bindings/opp/opp.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
> index 9847dfeeffcb..cd01028de305 100644
> --- a/Documentation/devicetree/bindings/opp/opp.txt
> +++ b/Documentation/devicetree/bindings/opp/opp.txt
> @@ -154,6 +154,10 @@ Optional properties:
>  - opp-suspend: Marks the OPP to be used during device suspend. If multiple OPPs
>    in the table have this, the OPP with highest opp-hz will be used.
>  
> +- opp-sustainable: Marks the OPP as sustainable. This property can be used for
> +  estimating sustainable performance of the whole system. If multiple OPPs in
> +  the table have this, the OPP with highest opp-hz will be used.
> +

Isn't this just the inverse of the turbo? or boost? flag we already 
have? 

Couldn't this be learned? I ran at this frequency and then overheated. 
That could be dependent on ambient temperatures or dust build up on 
fans/heatsink.

Rob