I'm interested in your opinion about that patch. You're also Cc'ed
to patch that using that feature.

I know, currently that patch will conflict with GPIOLIB patches in -mm,
so this is only RFC.

The point of CONFIG_GENERIC_GPIO is to be *the* conditional used to
tell whether that programming interface is available ... starting
from "#include <asm/gpio.h>", and including all gpio_*() calls.

So my first reaction is to not like this patch.  It changes semantics
in an incompatible way.  And AFAICT, needlessly so.

What other options did consider?  Like, why not #ifdef the GPIO parts
of that NAND driver, or have the whole driver depend on GENERIC_GPIO?

- Dave