linux-kernel - Re: [patch/rfc 2.6.25-git] gpio: sysfs interface

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Message-Id: <1209511772.311.55.camel@moss.renham>
Date:	Wed, 30 Apr 2008 09:29:32 +1000
From:	Ben Nizette <bn@...sdigital.com>
To:	David Brownell <david-b@...bell.net>
Cc:	Trent Piepho <tpiepho@...escale.com>,
	lkml <linux-kernel@...r.kernel.org>,
	hartleys <hartleys@...ionengravers.com>,
	Mike Frysinger <vapier.adi@...il.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: Re: [patch/rfc 2.6.25-git] gpio: sysfs interface


On Tue, 2008-04-29 at 14:55 -0700, David Brownell wrote:
> On Tuesday 29 April 2008, Ben Nizette wrote:
> > 4) Status quo.  Easy, efficient, potentially hard to discover which gpio
> > you actually want.
> > 
> > My vote's for 1 or 4.  The first one is heavier but easier.  The last
> > one will need something like the discussed file mapping ranges to gpios.
> 
> My vote is for #4 with a chip listing file.
> 
> I don't like the hacked names ... none of the other /sys/class/*/name
> files on any of my systems use hacked names.  The entire motivation for
> name hacking seems wrong to me, and by observation it's been rejected
> for all other class names.

Right, agreed.

I guess one last option (which is made hard by chip label non-uniqueness
but I'll throw out anyway) would be

/sys/class/gpio
	/chipa
		/gpio-n
			/value
			/direction
		/control
	/chipb
		:
		:

I guess this doesn't gain much over labelling files chipname:N (and has
the same pitfalls) but does at least seem less hackish.


	--Ben.
> 
> - Dave
> 
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