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Message-ID: <20220302045301.fq6nolscdfd5wvyo@vireshk-i7> 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
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