linux-kernel - Re: [PATCH v8 19/34] pwm: tegra: Add runtime PM and OPP support

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Message-ID: <CAPDyKFqr6NYO89io+6EfwrtELhTMps-tpGcAVbmuQ1_NnOD7Ew@mail.gmail.com>
Date:   Thu, 19 Aug 2021 16:04:50 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Peter Chen <peter.chen@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Richard Weinberger <richard@....at>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Lucas Stach <dev@...xeye.de>, Stefan Agner <stefan@...er.ch>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        linux-staging@...ts.linux.dev, linux-spi@...r.kernel.org,
        linux-pwm@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        DTML <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v8 19/34] pwm: tegra: Add runtime PM and OPP support

On Thu, 19 Aug 2021 at 15:21, Thierry Reding <thierry.reding@...il.com> wrote:
>
> On Tue, Aug 17, 2021 at 04:27:39AM +0300, Dmitry Osipenko wrote:
> > The PWM on Tegra belongs to the core power domain and we're going to
> > enable GENPD support for the core domain. Now PWM must be resumed using
> > runtime PM API in order to initialize the PWM power state. The PWM clock
> > rate must be changed using OPP API that will reconfigure the power domain
> > performance state in accordance to the rate. Add runtime PM and OPP
> > support to the PWM driver.
> >
> > Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> > ---
> >  drivers/pwm/pwm-tegra.c | 104 ++++++++++++++++++++++++++++++++--------
> >  1 file changed, 85 insertions(+), 19 deletions(-)
>
> Can this be safely applied independently of the rest of the series, or
> are there any dependencies on earlier patches?

Just to make sure we don't rush something in, I would rather withhold
all runtime PM related patches in the series, until we have agreed on
how to fix the in genpd/opp core parts. Simply, because those may very
well affect the deployments in the drivers.

>
> Thierry

Kind regards
Uffe