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

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Message-Id: <200804301049.07115.david-b@pacbell.net>
Date:	Wed, 30 Apr 2008 10:49:06 -0700
From:	David Brownell <david-b@...bell.net>
To:	Trent Piepho <tpiepho@...escale.com>
Cc:	Ben Nizette <bn@...sdigital.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 Tuesday 29 April 2008, Trent Piepho wrote:
> On Tue, 29 Apr 2008, David Brownell wrote:
> >
> >> If anything,
> >> the parsing code is simpler than what David has.
> >
> > Apples vs oranges.  Use the same command syntax if you're going
> > to make comparisons; I can save even more with "+export/-unexport"
> > syntax.  For comparable syntax, your stuff *IS* bigger.
> 
> If the code you wrote it not too complex, then why is the code I wrote, which
> is not larger, too complex?

Well, Andrew *did* object to the complexity.  But that wasn't
the point I was making there:  you were comparing apples and
oranges ... which makes it particularly easy to reach desired
conclusions like "only *this* one tastes like oranges!".


> >> David's code for parsing the control file plus code for generating a mapping
> >> range file would certainly be larger.
> >
> > The #3 option presumes some file listing chips and ranges too,
> > since GPIOs are exported only on demand.  Ditto #2 and #4...
> 
> You never answered how one was supposed to get the proper device from a
> script.

No I didn't.  But that's why I liked Ben's suggestion of creating
sysfs nodes for each gpio_chip.  That's actually a good example
of why folk like the one-value-per-attribute model with sysfs, at
least for information that would be used with scripting.

- Dave

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