Re: [PATCH 2/2] gpio: sch: Add interrupt support

Andy Shevchenko
2019-04-26T13:06:15Z

On Wed, Apr 24, 2019 at 12:39:35PM +0200, Jan Kiszka wrote:
> On 24.04.19 12:33, Mika Westerberg wrote:
> > On Wed, Apr 24, 2019 at 12:19:02PM +0200, Jan Kiszka wrote:

> > > And even if that were possible, we would be back to the square of existing
> > > devices without those definitions. If this were a recent chipset, I would
> > > say, "go, fix future firmware versions". But this one is legacy.
> >
> > Is it fixing some real issue with these legacy platforms? I mean without
> > the patch some GPE event is not handled properly? It was not clear to me
> > from the commit message.
> >
>
> Without that patch, you are forced to poll for event changes in your
> application, timer-driven. There are application that cannot process these
> GPIOs because they lack such logic (mraa with node-red-node-intel-gpio is a
> public example).

Just a side note: MRAA is a hack itself. It abuses almost all interfaces Linux
kernel provides.

--
With Best Regards,
Andy Shevchenko