linux-kernel - Re: [PATCH v3] gpio: interrupt consistency check for OF GPIO IRQs

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Message-ID: <5220F8AE.2080300@wwwdotorg.org>
Date:	Fri, 30 Aug 2013 13:55:26 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Lars Poeschel <larsi@....tu-dresden.de>,
	Lars Poeschel <poeschel@...onage.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 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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