linux-kernel - Re: [PATCH v2 4/4] PM: domains: Drop/restore performance state votes for devices at system PM

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Message-ID: <20210608142019.GG4200@sirena.org.uk>
Date:   Tue, 8 Jun 2021 15:20:19 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Stephan Gerhold <stephan@...hold.net>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Dmitry Osipenko <digetx@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Roja Rani Yarubandi <rojay@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: Re: [PATCH v2 4/4] PM: domains: Drop/restore performance state votes
 for devices at system PM

On Tue, Jun 08, 2021 at 04:08:55PM +0200, Ulf Hansson wrote:

> Honestly, I am not sure about what the regulator-fixed-domain intends
> to model, but I assume it's something that fits well to be modelled as
> a plain regulator, to start with.

> Perhaps Mark can chime in and spread some light over this?

IIRC it's for situations where there's a device that's normally built as
a separate chip that got built into a bigger SoC and wants to rear end
something onto a power domain, I guess especially if the power domain
doesn't cover the whole of a Linux device.

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