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

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Message-ID: <4557E6E4.5050307@billgatliff.com>
Date:	Sun, 12 Nov 2006 21:30:44 -0600
From:	Bill Gatliff <bgat@...lgatliff.com>
To:	David Brownell <david-b@...bell.net>
CC:	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

David:

David Brownell wrote:

>I know there have been discussions about standardizing GPIOs before,
>but nothing quite "took".  One of the more recent ones was
>
>  http://marc.theaimsgroup.com/?l=linux-kernel&m=110873454720555&w=2
>
>Below, find what I think is a useful proposal, trivially implementable on
>many ARMs (at91, omap, pxa, ep93xx, ixp2000, pnx4008, davinci, more) as well
>as the new AVR32.
>
>Compared to the proposal above, key differences include:
>  
>

Excellent proposal, I think it should be implemented as-is.  I don't 
care that this proposal only works for "real" GPIOs, and doesn't provide 
for a userspace API.

At its worst, this proposal offers an intermediate step towards a 
framework that can do both synchronous/real and asynchronous GPIO 
control.  At its best, provides a starting point for that framework AND 
a much-needed unification in an API that could really use cleaning up 
TODAY.  No downside, in my opinion.


b.g.

-- 
Bill Gatliff
bgat@...lgatliff.com

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