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

[Stephen Warren <swarren@wwwdotorg.org>]

On 09/10/2013 07:56 AM, Javier Martinez Canillas wrote:
...
> The only thing that this patch tries to solve is when a driver expect to request
> a IRQ and it doesn't care if is a real IRQ line from an interrupt controller or
> a GPIO pin mapped as an IRQ.

That can be solved in the interrupt chip driver. The fact the previous
attempt didn't work doesn't mean that it's impossible.

> With board files we used to explicitly do the GPIO setup
> (gpio_{request,direction_input}) but with DT these board files are gone and we
> need a way to setup a GPIO implicitly when is mapped as an IRQ.

Well, that's just an example of hacking around something in a board file
that should have been fixed in the GPIO/IRQ controller.

> That's the only use case that this patch covers.
...
> Also, it would be great if we can find a temporary solution so we can finally
> have ethernet working with DT on most OMAP2+ boards. Since I expect that doing
> the mentioned change on gpiolib would take at least a couple of kernel releases.

Really? I thought this patch was error-checking to make sure that
different drivers didn't request a GPIO and an IRQ that are actually the
same signal. This patch shouldn't affect any functionality except in
cases where there's a bug in the DT (incorrect GPIO/IRQ passed to some
driver).