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

Lars Poeschel
2013-09-04T08:35:44Z

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@wwwdotorg.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.