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

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Date:   Wed, 28 Oct 2020 16:47:13 -0500
From:   Nishanth Menon <nm@...com>
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>,
        <robh+dt@...nel.org>, <sboyd@...nel.org>, <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 14:08-20201028, 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.


By "sustainable", do you mean sustainable across Process, Voltage and
Temperature corners upto the max rated operational Power-ON hours
without IDLE state being achieved on the processor?

OR do you mean to leave it up to interpretation?
> +
>  - opp-supported-hw: This property allows a platform to enable only a subset of
>    the OPPs from the larger set present in the OPP table, based on the current
>    version of the hardware (already known to the operating system).
> -- 
> 2.17.1
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D