Message-ID: <5220F8AE.2080300@wwwdotorg.org>
Date: Fri, 30 Aug 2013 13:55:26 -0600
From: Stephen Warren <swarren@wwwdotorg.org>
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To: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
CC: Linus Walleij <linus.walleij@linaro.org>,
        Lars Poeschel <larsi@wh2.tu-dresden.de>,
        Lars Poeschel <poeschel@lemonage.de>,
        Grant Likely <grant.likely@linaro.org>,
        "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ian.campbell@citrix.com>,
        Kumar Gala <galak@codeaurora.org>, Pawel Moll <pawel.moll@arm.com>,
        Tomasz Figa <tomasz.figa@gmail.com>,
        Enric Balletbo i Serra <eballetbo@gmail.com>,
        Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>,
        Santosh Shilimkar <santosh.shilimkar@ti.com>,
        Kevin Hilman <khilman@linaro.org>, Balaji T K <balajitk@ti.com>,
        Tony Lindgren <tony@atomide.com>, Jon Hunter <jgchunter@gmail.com>
Subject: Re: [PATCH v3] gpio: interrupt consistency check for OF GPIO IRQs
References: <1377526030-32024-1-git-send-email-larsi@wh2.tu-dresden.de> <521D0964.2080209@wwwdotorg.org> <CACRpkdaWPQTPw8u+97iV8MRB1fdeS40kd242pJd3UE9Ler4kRQ@mail.gmail.com> <521FE637.3010805@collabora.co.uk>
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On 08/29/2013 06:24 PM, Javier Martinez Canillas wrote:
...
> We have been trying to solve this issue for a few months by now and Linus'
> approach seems to be the most sensible solution to me.
> 
> Drivers that request an IRQ and assume that platform code will request and setup
> the GPIO have been broken since the boards using these drivers were migrated to
> DT (e.g: smsc911x on OMAP2+ boards).

That's only true if the driver for the GPIO controller is buggy.
Whatever request_irq() maps down to in the GPIO/IRQ controller driver
simply needs to set up the pin as an interrupt input, then it doesn't
matter which order the driver does things.
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