linux-kernel - Re: [patch/rfc 2.6.19-rc5] arch-neutral GPIO calls

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Message-ID: <74d0deb30611292257n3f532abbyedef9b543b9d48ae@mail.gmail.com>
Date:	Thu, 30 Nov 2006 07:57:52 +0100
From:	"pHilipp Zabel" <philipp.zabel@...il.com>
To:	"David Brownell" <david-b@...bell.net>
Cc:	"Bill Gatliff" <bgat@...lgatliff.com>,
	"Paul Mundt" <lethal@...ux-sh.org>,
	"Linux Kernel list" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...l.org>,
	"Andrew Victor" <andrew@...people.com>,
	"Haavard Skinnemoen" <hskinnemoen@...el.com>, jamey.hicks@...com,
	"Kevin Hilman" <khilman@...sta.com>,
	"Nicolas Pitre" <nico@....org>,
	"Russell King" <rmk@....linux.org.uk>,
	"Tony Lindgren" <tony@...mide.com>
Subject: Re: [patch/rfc 2.6.19-rc5] arch-neutral GPIO calls

Hi,

On 11/23/06, David Brownell <david-b@...bell.net> wrote:
> On Tuesday 21 November 2006 7:57 am, Bill Gatliff wrote:
>
> > Once you're hiding the GPIO number behind an enumeration, you can create
> > a bitmap with more information than a single integer.  That extra
> > information could be used--- in my implementations, if any ever come
> > about--- to store routing information.
>
> But none of the existing GPIO users do that.  The goal wasn't to define
> a new notion of GPIO; it was collecting the existing ones under a single
> arch-neutral umbrella.
>
>
> > >It'd also be a big (and needless) disruption to code that's been working
> > >fine for several years now ...
> >
> > ... all of which is using the current GPIO API, you mean?  :)
>
> Effectively, yes.  I counted quite a few implementations in the current
> tree which can trivially (#defines) map to that API.

I tried to do that for pxa, the patch is attached.
So what is the state of this discussion, now that 2.6.19 is here?

I just submitted an input driver for GPIO buttons to linux-input that
we use in the handhelds.org kernel for sa1100, pxa and s3c2410 archs.
It needs some ugly
#ifdefs currently, but with common GPIO calls they all could go away.

regards
Philipp
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