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

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Message-ID: <52453545.3090504@collabora.co.uk>
Date:	Fri, 27 Sep 2013 09:35:33 +0200
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Stephen Warren <swarren@...dotorg.org>
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, aaro.koskinen@....fi,
	Paul Walmsley <paul@...an.com>, joelf@...com
Subject: Re: [RFC v2] gpio/omap: auto-setup a GPIO when used as an IRQ


On 09/27/2013 01:18 AM, Stephen Warren wrote:
> 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.
> 

Thanks Stephen,

I split the changes as suggested by Tony and posted as a patch-set and not an
RFC anymore:

[PATCH 1/2] gpio/omap: maintain GPIO and IRQ usage separately [1]
[PATCH 2/2] gpio/omap: auto-setup a GPIO when used as an IRQ [2]

Linus,

Could you please add Stephen Acked-by when taking the patches and also George
Cherian Tested-by that sent for this RFC. George it would be great if you can
also comment on which OMAP platform you had tested.

I cc'ed Aaro Koskinen and Paul Walmsley now which seems to have OMAP1 platforms
to test. Could you please test [1] and [2] on a OMAP1 board? These patches
solves a long standing issue we have on OMAP2+ when booting with DT and it would
be great if you can check that it does not cause regressions on OMAP1 based boards.

Thanks a lot and best regards,
Javier

[1]: https://patchwork.kernel.org/patch/2937351/
[2]: https://patchwork.kernel.org/patch/2937371/
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