Messages in this thread | | | Date | Tue, 03 Sep 2013 11:22:23 -0600 | From | Stephen Warren <> | Subject | Re: [PATCH v3] gpio: interrupt consistency check for OF GPIO IRQs |
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On 08/31/2013 09:32 AM, anish singh wrote: > On Sat, Aug 31, 2013 at 1:23 AM, Stephen Warren <swarren@wwwdotorg.org > <mailto: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. > > > Probably this issue(same gpio/irq being used by multiple drivers) is > very rare > but debugging it is bit difficult.
Really? It's easy to just look in /proc/interrupts and /sys/kernel/debug/gpio.
> This generally happens when we are working > on latest revised boards where latest gpio number of some driver > conflicts with the some other driver.
At least in the DT case, which is all that this patch solves, the DT is describing the HW GPIO/IRQ numbers, so the Linux GPIO numbers are irrelevant; everything is expressed as raw HW numbers, which are quite easy to check.
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