linux-kernel - Re: [PATCH v1 17/30] mmc: sdhci-tegra: Support OPP and core voltage scaling

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Message-ID: <CAEExFWsp0DWw1yO84e3vzr_YZkqkd+pyPfQQR3J2W6n3wTX4Jw@mail.gmail.com>
Date:   Fri, 6 Nov 2020 21:41:05 +0800
From:   Frank Lee <tiny.windzz@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Peter Chen <Peter.Chen@....com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lee Jones <lee.jones@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        driver-dev <devel@...verdev.osuosl.org>,
        linux-pwm@...r.kernel.org,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>, linux-usb@...r.kernel.org,
        "open list:SECURE DIGITAL HO..." <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-tegra@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v1 17/30] mmc: sdhci-tegra: Support OPP and core voltage scaling

On Fri, Nov 6, 2020 at 9:18 PM Dmitry Osipenko <digetx@...il.com> wrote:
>
> 06.11.2020 09:15, Viresh Kumar пишет:
> > Setting regulators for count as 0 doesn't sound good to me.
> >
> > But, I understand that you don't want to have that if (have_regulator)
> > check, and it is a fair request. What I will instead do is, allow all
> > dev_pm_opp_put*() API to start accepting a NULL pointer for the OPP
> > table and fail silently. And so you won't be required to have this
> > unwanted check. But you will be required to save the pointer returned
> > back by dev_pm_opp_set_regulators(), which is the right thing to do
> > anyways.
>
> Perhaps even a better variant could be to add a devm versions of the OPP
> API functions, then drivers won't need to care about storing the
> opp_table pointer if it's unused by drivers.

I think so. The consumer may not be so concerned about the status of
these OPP tables.
If the driver needs to manage the release, it needs to add a pointer
to their driver global structure.

Maybe it's worth having these devm interfaces for opp.

Yangtao