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

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Message-ID: <8e594ef8-1a50-4b74-9bd7-f848593588a7@arm.com>
Date:   Tue, 22 Feb 2022 11:23:03 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
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 2/22/22 11:15, Viresh Kumar wrote:
> On 22-02-22, 11:03, Lukasz Luba wrote:
>> OK, I misunderstood that. If that is possible than it would
>> be great. I'm assuming you are taking about OPP v2.
> 
> Yes.
> 
>> I can relax the
>> requirement that I need to provide this DT-EM for arm32, since they
>> have a legacy OPP v1.
> 
> OPP V2 or V1 doesn't have anything to do with arm32/64. Anyone can implement the
> newer V2 version (basically whoever wants something more than a simple freq/volt
> pair). So arm32 SoC's that want to use the DT-EM thing, should migrate to
> opp-v2, we can't support that with opp-v1.
> 
>> So we might have an entry similar that interconnect for the
>> bandwidth, but for us it would be 'opp-power-uw'?
> 
> I will rather say similar to opp-microvolt or opp-microamp, so it better be
> opp-microwatt.
> 
>> Let me have a look about some examples how that could be just
>> added/extended in the opp table but from board file.
>> If you have some handy link, I would be grateful.
> 
> The file I provided earlier:
> 
> arch/arm64/boot/dts/freescale/imx8mq-librem5-r3.dts
> 
> This is updating opp-microvolt property of a single OPP node in the whole table.
> Pretty much like this only.
> 

Thanks, I'll use that example for the v2