linux-kernel - Re: [RFC v2] gpio/omap: auto-setup a GPIO when used as an IRQ

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Message-ID: <5244C0C4.2030004@wwwdotorg.org>
Date:	Thu, 26 Sep 2013 17:18:28 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
CC:	Santosh Shilimkar <santosh.shilimkar@...com>,
	Kevin Hilman <khilman@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Lars Poeschel <larsi@....tu-dresden.de>,
	Grant Likely <grant.likely@...aro.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>,
	Balaji T K <balajitk@...com>,
	Tony Lindgren <tony@...mide.com>,
	Jon Hunter <jgchunter@...il.com>, linux-gpio@...r.kernel.org,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, r.sricharan@...com,
	holler@...oftware.de
Subject: Re: [RFC v2] gpio/omap: auto-setup a GPIO when used as an IRQ

On 09/24/2013 01:58 AM, Javier Martinez Canillas wrote:
> The OMAP GPIO controller HW requires a pin to be configured in GPIO
> input mode in order to operate as an interrupt input. Since drivers
> should not be aware of whether an interrupt pin is also a GPIO or not,
> the HW should be fully configured/enabled as an IRQ if a driver solely
> uses IRQ APIs such as request_irq(), and never calls any GPIO-related
> APIs. As such, add the missing HW setup to the OMAP GPIO controller's
> irq_chip driver.
> 
> Since this bypasses the GPIO subsystem we have to ensure that another
> caller won't be able to request the same GPIO pin that is used as an
> IRQ and set its direction as output. Requesting the GPIO and setting
> its direction as input is allowed though.

FWIW, the concept of this patch,
Acked-by: Stephen Warren <swarren@...dia.com>

I didn't review the code; just skimmed it to see where the new
functionality was implemented.
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