linux-kernel - Re: [PATCH 2/3] opp: Add devres wrapper for dev_pm_opp_set_prop

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Message-ID: <CAEExFWtYrT3psuLC0fd7cX2GrmPaYxqZK65OLUv+2s97ehz97g@mail.gmail.com>
Date:   Fri, 30 Oct 2020 19:19:00 +0800
From:   Frank Lee <tiny.windzz@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Frank Lee <frank@...winnertech.com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        airlied@...ux.ie, Daniel Vetter <daniel@...ll.ch>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, jcrouse@...eaurora.org,
        eric@...olt.net, kholk11@...il.com, emil.velikov@...labora.com,
        gustavoars@...nel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 2/3] opp: Add devres wrapper for dev_pm_opp_set_prop_name

On Wed, Oct 28, 2020 at 10:46 PM Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> On 28-10-20, 19:02, Frank Lee wrote:
> > On Wed, Oct 28, 2020 at 6:29 PM Viresh Kumar <viresh.kumar@...aro.org> wrote:
> > >
> > > On 12-10-20, 21:55, Frank Lee wrote:
> > > > From: Yangtao Li <tiny.windzz@...il.com>
> > > >
> > > > Add devres wrapper for dev_pm_opp_set_prop_name() to simplify driver
> > > > code.
> > > >
> > > > Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> > > > Signed-off-by: Yangtao Li <frank@...winnertech.com>
> > > > ---
> > > >  drivers/opp/core.c     | 39 +++++++++++++++++++++++++++++++++++++++
> > > >  include/linux/pm_opp.h |  6 ++++++
> > > >  2 files changed, 45 insertions(+)
> > >
> > > On a second thought I am looking at dropping this one as you haven't
> > > added any users yet and I am afraid it will stay unused.
> >
> > Now it looks like that dev_pm_opp_set_prop_name() is used relatively less.
> > Maybe we can wait until a caller, and then pick up the patch.
>
> I am even wondering if we should be adding any of the devm_* helpers
> for now to be honest. Even for the other one we have only one user.
> Them major user of the OPP core is the CPU subsystem and it is never
> going to use these devm_* helpers as the CPU device doesn't get bound
> to a driver, it is rather a fake platform device which gets the
> cpufreq drivers probed. So the only users of these devm_* helpers is
> going to be non-CPU devices. Considering that we have only one user
> right now, it may be better to just fix it instead of adding any of
> the devm_* helpers.

GPU is also a relatively large number of opp consumers.
Most of the time, the dev_pm_opp_set_* functions will only be set once.
If don't need the driver to dynamically manage and release the opp, it
may be OK？

Yangtao