linux-kernel - Re: [PATCH] GPIOLIB: add generic gpio_set

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Message-ID: <CACRpkdZUxYP0Mbe+heEwrZE5VC+J42g_-QAusrOsUuBPT324Hw@mail.gmail.com>
Date:	Tue, 9 Aug 2011 12:11:51 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Rohit Vaswani <rvaswani@...eaurora.org>
Cc:	Kyungmin Park <kmpark@...radead.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Paul Mundt <lethal@...ux-sh.org>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	workgroup.linux@....com, Barry Song <Baohua.Song@....com>
Subject: Re: [PATCH] GPIOLIB: add generic gpio_set_pull API

On Tue, Aug 9, 2011 at 3:45 AM, Rohit Vaswani <rvaswani@...eaurora.org> wrote:

> If we add this API - the remaining gpio controls like drive strength and
> function select could also be added,

I agree.

> which eats into the pinmux domain.

That's not so bad, since the pinctrl/pinmux subsystem is just a prototype
people may want to wrap up their drivers into gpio_chip/gpiolib as
they stand today to atleast get some isolation. Later on they can
refactor and migrate to a pinctrl/pinmux subsystem.

The latter will take some time to provide anyway, since I have been
asked to restructure it so as not to use a global pin number space.

> Linus W. had a patch earlier which added an API for a gpio config to be
> specified through gpiolib. " gpio: add a custom configuration mechanism to
> gpiolib" which is sort of an extensible model of this API.

Yes I think I have already suggested a bunch of ways to skin this
cat but somehow none of them seem to win general approval.

Yours,
Linus Walleij
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