linux-kernel - Re: [PATCH] gpio/regulator: Allow nonexclusive GPIO access

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Message-ID: <20181011175406.GH25351@sirena.org.uk>
Date:   Thu, 11 Oct 2018 18:54:06 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH] gpio/regulator: Allow nonexclusive GPIO access

On Thu, Oct 11, 2018 at 07:01:13PM +0200, Linus Walleij wrote:
> On Thu, Oct 11, 2018 at 4:43 PM Mark Brown <broonie@...nel.org> wrote:
> > On Thu, Oct 11, 2018 at 04:35:31PM +0200, Linus Walleij wrote:

> > enable line so you don't need to use the bus to do the enables.  That
> > should just be a case of adding this flag to all the drivers that have
> > already been converted to gpiod (including the core code that's in
> > regulator_ena_gpio_request() which I thought was coping with this
> > already) unless I'm missing something?

> Sorry if I don't get it... we already have code in the core to
> check if the same gpiod is used by two regulators.
> regulator_ena_gpio_request() does this:

>         if (config->ena_gpiod)
>                 gpiod = config->ena_gpiod;
>         else
>                 gpiod = gpio_to_desc(config->ena_gpio);

> So after the change I made to fixed.c this comes in through
> config->ena_gpiod.

Other regulators that have GPIO control for their enables do their own
requests (as does the core) so don't they all need to set the flag
GPIOD_FLAGS_BIT_NONEXCLUSIVE when they request otherwise it'll only work
in systems where the regulators after the first that request the GPIO
are fixed regulators?

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