linux-kernel - Re: [PATCH 1/5] gpiolib: introduce set

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Date:	Fri, 21 May 2010 14:34:32 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Brownell <david-b@...bell.net>
Cc:	felipe.balbi@...ia.com,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/5] gpiolib: introduce set_debounce method

> One of the earlier examples of why to want debouncing (in the
> original discussion, not this one) was for buttons (one signal
> per button press) and the hardware designers don't necessarily
> hook buttons up to only GPIOs with hardware debounce.  So code
> to kick in debounce there needed to be sensitive to whether or
> not the capability was available ... and moreover, whether the
> debounce scale was adequate to compensate the contact chatter.
> When not, then software debounce was inescapable.

And someone who needs it can contribute it. The proposed patch causes no
problems in this area.

Alan
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