linux-kernel - RE: [PATCH 1/2] gpiolib: introduce gpio_set

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Date:	Tue, 29 Nov 2011 08:51:42 -0800
From:	Stephen Warren <swarren@...dia.com>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Igor Grinberg <grinberg@...pulab.co.il>
CC:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: RE: [PATCH 1/2] gpiolib: introduce gpio_set_pullup

Jean-Christophe PLAGNIOL-VILLARD wrote at Monday, November 28, 2011 7:37 PM:
> On 11:35 Sun 27 Nov     , Igor Grinberg wrote:
> > On 11/25/11 17:34, Mark Brown wrote:
> > > On Fri, Nov 25, 2011 at 03:08:39PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > >
> > >> +/**
> > >> + * gpio_set_pullup - sets @pullup for a @gpio
> > >> + * @gpio: the gpio to set pullup
> > >> + * @pullup: pullup level
> > >> + */
> > >> +int gpio_set_pullup(unsigned gpio, unsigned pullup)
> > >
> > > This has some overlap with the pinmux subsystem.  We also need
> > > documentation of what the pullup values mean.
> yes and no
> 
> as some gpio IP (only gpio i2c extender as example ) have it too
> so you can not use the pinmux for this

Why not?

I believe the pinctrl subsystem should be applicable to any chip, be it
the main SoC/CPU in the system, or any other chip. We don't currently
have any non-SoC drivers, but that's just because nobody has written them
yet; there's no technical reason they couldn't exist.

-- 
nvpublic

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