From: Balaji T K <balajitk@ti.com>
To: Tony Lindgren <tony@atomide.com>
Cc: Javier Martinez Canillas <javier.martinez@collabora.co.uk>,
Santosh Shilimkar <santosh.shilimkar@ti.com>,
Kevin Hilman <khilman@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
Stephen Warren <swarren@wwwdotorg.org>,
Lars Poeschel <larsi@wh2.tu-dresden.de>,
Grant Likely <grant.likely@linaro.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>,
Jon Hunter <jgchunter@gmail.com>, <linux-gpio@vger.kernel.org>,
<linux-omap@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <r.sricharan@ti.com>,
<holler@ahsoftware.de>
Subject: Re: [RFC v2] gpio/omap: auto-setup a GPIO when used as an IRQ
Date: Tue, 24 Sep 2013 21:15:59 +0530 [thread overview]
Message-ID: <5241B3B7.5070701@ti.com> (raw)
In-Reply-To: <20130924154048.GM2684@atomide.com>
On Tuesday 24 September 2013 09:10 PM, Tony Lindgren wrote:
> * Javier Martinez Canillas <javier.martinez@collabora.co.uk> [130924 01:06]:
>> 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.
>
> Also please mention the regression that this fixes. So far we know
> that smsc911x for tobi and igep boards in mainline, and also the
> MMC card detect for omap4 boards.
Hi Tony,
Card detect on omap4 board (sdp and panda) is not based on omap gpio,
so I think this fix is not applicable for omap4.
Card detect line for SD card goes to power IC on OMAP4 panda and SDP.
next prev parent reply other threads:[~2013-09-24 15:46 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-24 7:58 Javier Martinez Canillas
2013-09-24 15:40 ` Tony Lindgren
2013-09-24 15:45 ` Javier Martinez Canillas
2013-09-24 15:45 ` Balaji T K [this message]
2013-09-24 15:48 ` Santosh Shilimkar
2013-09-24 15:58 ` Tony Lindgren
2013-09-24 15:56 ` Tony Lindgren
2013-09-26 23:18 ` Stephen Warren
2013-09-27 7:35 ` Javier Martinez Canillas
2013-09-27 18:46 ` George Cherian
2013-09-27 20:36 ` Aaro Koskinen
2013-09-30 1:23 ` Paul Walmsley
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