[PATCH] RFC: let gpiod_get_optional et all return NULL when GPIOLIB is not enabled

[Linus Walleij]

On Thu, Apr 9, 2015 at 4:20 AM, Alexandre Courbot <gnurou at gmail.com> wrote:

> Having GPIO disabled means there is no GPIO support, including the
> ability to look for GPIOs. -ENOSYS is a well-documented error-code
> which meaning also applies to the gpio_*_optional functions (we don't
> have support for the operation you requested). If a driver or
> architecture really, really needs GPIO support they can require or
> depend on CONFIG_GPIOLIB, and the problem goes away. If they can work
> with and without gpiolib, then they should check for -ENOSYS when they
> request GPIOs and behave accordingly.

Makes sense. We have ARCH_WANT_OPTIONAL_GPIOLIB and
ARCH_REQUIRE_GPIOLIB for this reason.

Yours,
Linus Walleij