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Date: Mon, 9 Sep 2013 17:19:24 +0100
From: Mark Brown <broonie@...nel.org>
To: Stephen Warren <swarren@...dotorg.org>
Cc: Lars Poeschel <poeschel@...onage.de>,
Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
Linus Walleij <linus.walleij@...aro.org>,
Lars Poeschel <larsi@....tu-dresden.de>,
Grant Likely <grant.likely@...aro.org>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ian.campbell@...rix.com>,
Kumar Gala <galak@...eaurora.org>,
Pawel Moll <pawel.moll@....com>,
Tomasz Figa <tomasz.figa@...il.com>,
Enric Balletbo i Serra <eballetbo@...il.com>,
Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
Santosh Shilimkar <santosh.shilimkar@...com>,
Kevin Hilman <khilman@...aro.org>,
Balaji T K <balajitk@...com>,
Tony Lindgren <tony@...mide.com>,
Jon Hunter <jgchunter@...il.com>
Subject: Re: [PATCH v3] gpio: interrupt consistency check for OF GPIO IRQs
On Wed, Sep 04, 2013 at 02:16:36PM -0600, Stephen Warren wrote:
> On 09/04/2013 03:05 AM, Lars Poeschel wrote:
> > The driver that tries to use the GPIO requested by this patch before HAS to
> > fail. This is exactly the intention of this patch. We don't want the GPIO to
> > be requested any more, if it is used as an interrupt pin.
> That will break existing drivers. There are drivers that request the
> same GPIO and IRQ. IIRC, the SDHCI CD (Card Detect) GPIO is requested
> that way.
Yes, plus input devices and audio jack detection among others. This
pattern is very common if the GPIO is actually being used as a GPIO, an
edge triggered interrupt is used to flag when something happens and the
state is determined by reading the GPIO state (often with some
debounce).
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