linux-kernel - Re: [PATCH v3 4/4] Documentation: EM: Describe new registration method using DT

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Date:   Thu, 24 Feb 2022 14:45:08 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
        rafael@...nel.org, daniel.lezcano@...aro.org, nm@...com,
        sboyd@...nel.org, mka@...omium.org, dianders@...omium.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 4/4] Documentation: EM: Describe new registration
 method using DT

On 24-02-22, 08:11, Lukasz Luba wrote:
> The new registration method allows to get power values from the DT OPP
> definition. The new OPP entry property "opp-microwatt" contains total
> power expressed in micro-Watts. Align the EM documentation with this
> new possible registration method of 'advanced' EM.
> 
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---
>  Documentation/power/energy-model.rst | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/power/energy-model.rst b/Documentation/power/energy-model.rst
> index 5ac62a7b4b7c..719253fd5215 100644
> --- a/Documentation/power/energy-model.rst
> +++ b/Documentation/power/energy-model.rst
> @@ -113,6 +113,16 @@ to: return warning/error, stop working or panic.
>  See Section 3. for an example of driver implementing this
>  callback, or Section 2.4 for further documentation on this API
>  
> +Registration of 'advanced' EM using DT

I am not really sure if this should be called *Advanced*. Just call it
registration of EM using DT.

> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +The 'advanced' EM can also be registered using OPP framework and information
> +in DT "operating-points-v2". Each OPP entry in DT can be extended with a
> +property "opp-microwatt" containing micro-Watts power value. This OPP DT
> +property allows a platform to register EM power values which are reflecting
> +total power (static + dynamic). These power values might be coming directly
> +from experiments and measurements.
> +
>  Registration of 'simple' EM
>  ~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  
> -- 
> 2.17.1

-- 
viresh