linux-kernel - Re: [PATCH v2] regulator: devres: introduce managed enable and disable operations

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Message-ID: <CAKdAkRSdELfPG+P+CD2yhffVSssEjc8MJAJ7fc_OQPwSvu_bqA@mail.gmail.com>
Date:   Wed, 22 Feb 2017 23:25:22 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] regulator: devres: introduce managed enable and
 disable operations

On Tue, Feb 21, 2017 at 10:56:34AM -0800, Mark Brown wrote:
> On Tue, Feb 21, 2017 at 12:30:03AM -0800, Dmitry Torokhov wrote:
> > On Mon, Feb 20, 2017 at 11:02:58AM -0800, Mark Brown wrote:
> > > On Mon, Feb 13, 2017 at 10:51:52AM -0800, Dmitry Torokhov wrote:
>
> > But that is what I meant here about managed action. You are not
> > interacting with managed regulator here, you have managed enable. There
> > is absolutely nothing preventing you from calling
> > devm_regulator_enable() on a regulator that was obtained with
> > regulator_get() (i.e. non-managed).
>
> That's not the point, the point is using both devm_regulator_enable()
> and regulator_enable() and so on.

I understand that you have objection that devm_regulator_enable() and
regulator_enable() can be used together, I just do not see it being a
problem in practice.

I still think we need a way for the drivers to "undo" the enable
automatically. Do you have some other idea how to achieve this? Do you
maybe want regulator_put() to undo all outstanding disables for the
regulator? Then drivers would not need to care about disabling
regulators in error paths/driver teardown.

Where would you want to take the API?

Thanks.

-- 
Dmitry