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

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Message-ID: <5584741.67AvVurcHF@lem-wkst-02>
Date:	Wed, 04 Sep 2013 10:35:44 +0200
From:	Lars Poeschel <poeschel@...onage.de>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Lars Poeschel <larsi@....tu-dresden.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>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	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 Wednesday 04 September 2013 11:29:47, Stephen Warren wrote:
> On 09/03/2013 06:35 AM, Linus Walleij wrote:
> > On Fri, Aug 30, 2013 at 9:53 PM, Stephen Warren <swarren@...dotorg.org> 
wrote:
> >> I still haven't seen an answer to why we really care about this; how
> >> many times has code actually allocated the same GPIO/IRQ when it
> >> shouldn't, in a way that it wasn't detectable by some other mechanism,
> >> i.e. the feature just not working? Why are we even trying to solve this
> >> issue? I'm not totally convinced it even makes sense to try and solve it.
> > 
> > We care about this because a number of OMAP boards are not
> > working properly when booted from device tree, and they have a hard
> > time figuring out a solution to the problem. Last try exploded. Now
> > they are looking to create a patch that will fix the actual problem.
> 
> Is something missing from /proc/interrupts or /sys/kernel/debug/gpios?
> If so, let's just add it.

That would require procfs to be mounted to /proc and even CONFIG_PROC_FS to be 
compiled in. Drivers have to work without that requirement.
That would require CONFIG_DEBUG_FS to be set, right? Drivers have to work 
without that.
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