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

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From: David Brownell
Date: Tuesday, April 29, 2008 - 2:56 pm

On Tuesday 29 April 2008, Trent Piepho wrote:

I just ssh'd into three embedded boards I have handy, and they have
respectively four, four, and seven entries there.  That "seven"
case is actually incorrect ... the other three serial ports aren't
connected to anything.

So:  yes, adding a few hundred useless sysfs nodes *IS* a problem
in the target environment of embedded boards.

Note that "read-only until export" is far from straightforward
to achieve.



Which fails in a common case:  chip labels are not unique.



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.



The #3 option presumes some file listing chips and ranges too,
since GPIOs are exported only on demand.  Ditto #2 and #4...

- Dave

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Messages in current thread:
[patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Mon Apr 28, 12:39 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Andrew Morton, (Mon Apr 28, 1:46 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Ben Nizette, (Mon Apr 28, 4:01 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Trent Piepho, (Mon Apr 28, 4:09 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Mon Apr 28, 4:28 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Mon Apr 28, 5:44 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Mon Apr 28, 5:45 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Ben Nizette, (Mon Apr 28, 5:47 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Ben Nizette, (Mon Apr 28, 6:58 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Andrew Morton, (Mon Apr 28, 7:54 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Greg KH, (Mon Apr 28, 8:42 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Mon Apr 28, 8:44 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Ben Nizette, (Mon Apr 28, 9:47 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Trent Piepho, (Mon Apr 28, 10:48 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Trent Piepho, (Mon Apr 28, 11:17 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Ben Nizette, (Tue Apr 29, 5:35 am)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Trent Piepho, (Tue Apr 29, 11:15 am)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Tue Apr 29, 11:45 am)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Andrew Morton, (Tue Apr 29, 12:09 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Tue Apr 29, 2:28 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Tue Apr 29, 2:55 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Tue Apr 29, 2:56 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Tue Apr 29, 3:39 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Ben Nizette, (Tue Apr 29, 4:29 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Trent Piepho, (Tue Apr 29, 5:49 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Tue Apr 29, 6:04 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Ben Nizette, (Tue Apr 29, 7:08 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Trent Piepho, (Tue Apr 29, 8:13 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Ben Nizette, (Wed Apr 30, 3:33 am)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Wed Apr 30, 10:42 am)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Wed Apr 30, 10:49 am)
[patch/rfc 2.6.25-git v2] gpio: sysfs interface, David Brownell, (Wed Apr 30, 2:34 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, Trent Piepho, (Wed Apr 30, 3:47 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, Ben Nizette, (Wed Apr 30, 4:14 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, Ben Nizette, (Wed Apr 30, 4:28 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, David Brownell, (Wed Apr 30, 7:08 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, David Brownell, (Wed Apr 30, 7:12 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, Trent Piepho, (Wed Apr 30, 8:41 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, David Brownell, (Wed Apr 30, 9:35 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, Trent Piepho, (Thu May 1, 2:16 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, David Brownell, (Thu May 1, 2:40 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Pavel Machek, (Fri May 2, 1:36 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, David Brownell, (Fri May 2, 7:58 pm)
Re: [patch/rfc 2.6.25-git v2] gpio: sysfs interface, David Brownell, (Fri May 2, 8:05 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Sat May 17, 3:14 pm)
[patch 2.6.26-rc2-git] gpio: sysfs interface, David Brownell, (Sat May 17, 5:36 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Ben Nizette, (Sat May 17, 9:55 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Pavel Machek, (Mon May 19, 3:39 pm)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, David Brownell, (Mon May 19, 6:26 pm)
Re: [patch 2.6.26-rc2-git] gpio: sysfs interface, Andrew Morton, (Tue May 20, 12:17 am)
Re: [patch/rfc 2.6.25-git] gpio: sysfs interface, Pavel Machek, (Tue May 20, 1:02 am)