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

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Date:	Mon, 5 Dec 2011 16:40:11 +0100
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Igor Grinberg <grinberg@...pulab.co.il>,
	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

On 08:51 Tue 29 Nov     , Stephen Warren wrote:
> 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.
> 
sorry pinmux for gpio specific management i's overkill

Best Regards,
J.
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