linux-kernel - Re: [PATCH v4 3/4] OPP: Add support of "opp-microwatt" for advanced EM registration

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Date:   Wed, 2 Mar 2022 10:23:01 +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 v4 3/4] OPP: Add support of "opp-microwatt" for advanced
 EM registration

On 01-03-22, 09:35, Lukasz Luba wrote:
> The Energy Model (EM) can be created based on DT entry:
> 'dynamic-power-coefficient'. It's a 'simple' EM which is limited to the
> dynamic power. It has to fit into the math formula which requires also
> information about voltage. Some of the platforms don't expose voltage
> information, thus it's not possible to use EM registration using DT.
> 
> This patch aims to fix it. It introduces new implementation of the EM
> registration callback. The new mechanism relies on the new OPP feature
> allowing to get power (which is coming from "opp-microwatt" DT property)
> expressed in micro-Watts.
> 
> The patch also opens new opportunity to better support platforms, which
> have a decent static power. It allows to register 'advanced' EM (based
> on real power measurements) which models total power (static + dynamic),
> so better reflects real HW.

Advanced :(

-- 
viresh