[alsa-devel] [PATCH] ASoC: simple-card: Add mic and hp detect gpios.

[Mark Brown]

On Wed, Oct 08, 2014 at 10:50:00AM +0200, Linus Walleij wrote:
> On Wed, Oct 8, 2014 at 9:05 AM, Alexandre Courbot <gnurou at gmail.com> wrote:

> > But transition to gpiod is the way to ultimately fix this issue, as
> > well as many others. Not to mention that renumbering GPIOs will
> > certainly make a few users of the GPIO sysfs (another abomination,
> > agreed) unhappy. I can only recommend switching drivers to gpiod when
> > such issues are spotted.

> Yeah that is another issue ... we end up in catch 22 situations like
> that, renumber the GPIOs, OK, then we break the ABI.

> Admittedly that "ABI" is something people break all the time,
> /sys/*gpioN just isnt what it should be, not stable at all.

> I'm not against renumbering GPIO if it's minor effort, but if it
> start to consume hundreds of hours and regressions and what not,
> that time is better spent focusing on the gpiod transition.

My guess is that it's relatively little work for most platforms - with
the systems I've done enough work on to notice everything is keyed off a
few defines in the header file.  Things tend to be worse in out of tree
code but mainline's generally been pretty good.
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