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

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Message-ID: <663067.14695.qm@web180316.mail.gq1.yahoo.com>
Date:	Fri, 21 May 2010 06:23:12 -0700 (PDT)
From:	David Brownell <david-b@...bell.net>
To:	felipe.balbi@...ia.com
Cc:	"Balbi Felipe \(Nokia-D/Helsinki\)" <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


> > Not all GPIOs have hardware debounce though, so
> offering this
> > capability sort of begs the question of where/how to
> provide a software debounce mechanism too...
> 
> how about adding a flag for supported features and if that
> hardware doesn't support we simply return,

Presense of a debounce method would suffice when gpiolib is
in use (vs direct implementation of the API provided by gpiolib).


> or fallback to
> software emulation if chosen by the user. 

ISTR that if you look back to the original discussion about
GPIO debouncing, you will find such a software implementation;
and maybe such an integration ... 


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