linux-kernel - Re: [PATCH] gpio: vt8500: Export dedicated GPIO before multifunction pins.

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Date:	Fri, 11 Jan 2013 07:44:33 +1300
From:	Tony Prisk <linux@...sktech.co.nz>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linux.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	vt8500-wm8505-linux-kernel@...glegroups.com
Subject: Re: [PATCH] gpio: vt8500: Export dedicated GPIO before
 multifunction pins.

On Thu, 2013-01-10 at 11:49 +0100, Linus Walleij wrote:
> On Sun, Dec 30, 2012 at 9:29 PM, Tony Prisk <linux@...sktech.co.nz> wrote:
> 
> > The vendor does not provide numbering for gpio pins. Vendor source
> > exports dedicated gpio pins first, followed by multifunction pins.
> > As this is what end users expect, this patch changes vt8500 and wm8505
> > to do the same.
> >
> > Signed-off-by: Tony Prisk <linux@...sktech.co.nz>
> 
> So how many existing userspace applications does this patch
> break? Has this system been widely deployed so a kernel
> upgrade will cause problems for people?
> 
> But applied anyway, unless someone screams about it real
> soon now. That seems to be the only way to get people to tell
> us about their use cases.
> 
> Could you consider adding names to the exported GPIO pins
> on the vt8500 series please? Then userspace can atleast
> try to locate the right pin.
> 
> Yours,
> Linus Walleij

In terms of userspace apps, my best guess would be 'I dunno'. This was
requested by the only end-user to ask a question since mainline support
was added - He couldn't find the external GPIO's in the 200+ that were
listed.

This also makes all the platforms the same now - external GPIO's are now
exported first (0..x) which is better in the long term for userspace.

The names is a bit of a problem, but I will try my best. We have limited
datasheets etc from the vendor, so knowing what things do is a bit of a
mystery sometimes.

Regards
Tony P

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