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

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Date:	Mon, 23 Sep 2013 10:07:24 -0700
From:	Tony Lindgren <tony@...mide.com>
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>,
	Stephen Warren <swarren@...dotorg.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>,
	Jon Hunter <jgchunter@...il.com>, linux-gpio@...r.kernel.org,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] gpio/omap: auto-setup a GPIO when used as an IRQ

* Javier Martinez Canillas <javier.martinez@...labora.co.uk> [130923 10:09]:
> On 09/23/2013 06:45 PM, Tony Lindgren wrote:
> > 
> > Hmm does this still work for legacy platform data based
> > drivers that are doing gpio_request() first?
> > 
> 
> Yes it still work when booting using board files. I tested on my OMAP3 board and
> it worked in both DT and legacy booting mode.

OK great.
 
> > And what's the path for clearing things for PM when free_irq()
> > gets called? It seems that this would leave the GPIO bank
> > enabled causing a PM regression?
> > 
> 
> Indeed, I did set bank->mod_usage |= 1 << offset so the bank is enabled if the
> device goes to suspended and then resumed but I completely forget about the
> clearing path when the IRQ is freed.
> 
> Which makes me think that we should probably maintain two usage variables, one
> for GPIO and another one for IRQ and check both of them on the suspend/resume pm
> functions.

Yes that it seems that they should be treated separately.

Regards,

Tony
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