On Tue, Jun 2, 2015 at 2:05 AM, Linus Walleij [off-list ref] wrote:

On Wed, May 27, 2015 at 5:26 AM, Gregory Fong [off-list ref] wrote:

quoted

I've now actually attempted to use the gpiolib irqchip code.  This
driver can't directly use gpiochip_irqchip_add() because of the
multiple gpiochip : one irqchip map.  At first, I thought it might be
possible to simply add a new argument (or break things into a helper
function) to allow setting the associated IRQ domain, but then I can't
use the generic map and unmap functions which expect the irq_domain
host_data member to be struct gpiochip *, which makes no sense in this
case.  That puts me right back to implementing a special version of
the map and unmap function.

I see.

I think I was wrong, it isn't actually necessary to have a single
irq_chip as long as all of the IRQs use the same handler.  I have a
preliminary implementation doing that instead that seems to work fine.
Once I've had a chance to verify that it works in all cases, will post
that as v3.

Cheers,
Gregory