linux-kernel - Re: [RFC][PATCH 1/2] dt-bindings: power: add Energy Model bindings

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Message-ID: <20220222101242.chwcxan2nyhczqth@vireshk-i7>
Date:   Tue, 22 Feb 2022 15:42:42 +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: [RFC][PATCH 1/2] dt-bindings: power: add Energy Model bindings

On 22-02-22, 10:03, Lukasz Luba wrote:
> 
> 
> On 2/22/22 09:45, Viresh Kumar wrote:
> > On 22-02-22, 08:06, Lukasz Luba wrote:
> > > I'm not sure if that would be flexible enough to meet the requirement:
> > > power for each OPP might be different in one board vs. other board.
> > 
> > Don't DT files overload values from board files all the time ? Why wouldn't the
> > same apply for OPP table as well ?
> 
> In that SoC and family of the boards, there are no such examples.

Here is one I think.

arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts

> It used to be popular in arm32 boards, but I'm not sure nowadays.

I think it is still common, not with OPPs though.

> > > AFAIK the OPP definition is more SoC specific.
> > 
> > This isn't about OPP definition as well, but just that if DT allows you to
> > override or not. I think it will.
> > 
> 
> Redefining the whole OPP table, when the freq, voltage, interconnect,
> and other old entries don't change isn't too messy?

I think you misunderstood what I said. The common part of the OPP table should
stay in the central .dtsi file. The dts files though, should just add the power
specific values to the existing OPP table.

> As I said, I would prefer something lightweight, not redefining all
> stuff from OPP in every board file.

-- 
viresh