linux-kernel - Re: [PATCH v3 4/4] regulator: core: Add voltage support for sync

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Date:   Mon, 20 Jul 2020 20:24:59 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        John Stultz <john.stultz@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH v3 4/4] regulator: core: Add voltage support for
 sync_state() callbacks

On Mon, Jul 20, 2020 at 7:35 AM Mark Brown <broonie@...nel.org> wrote:
>
> On Wed, Jul 15, 2020 at 09:20:53PM -0700, Saravana Kannan wrote:
>
> > -     if (!handoff)
> > +     if (!handoff) {
> >               regulator_disable(rdev->boot_limits);
> > -     else
> > +             regulator_set_voltage(rdev->boot_limits, 0, INT_MAX);
> > +     } else {
> >               rdev->use_count--;
> > +     }
> >       destroy_regulator(rdev->boot_limits);
>
> These sets should be completely redundant since they will go away when
> the regulator is destroyed, if there's an issue with that we should fix
> it rather than bodging around it.

Yeah, I was aware of this, but I thought it was clearer to have an
explicit unwinding. Since you prefer the other way around, I can drop
the set voltage.

Btw, going a tangent, why is regulator_set_voltage() not dependent on
a consumer's regulator enable request? If they don't care if the
regulator goes off, do they really care if the voltage goes lower?
What's the reason behind not tying voltage request with the enable
request?

-Saravana