Hi Uwe,

On Mon, Mar 20, 2017 at 11:31 AM, Uwe Kleine-K?nig
[off-list ref] wrote:

On Mon, Mar 20, 2017 at 10:56:14AM +0100, Geert Uytterhoeven wrote:

quoted

Documentation/gpio/consumer.txt rightfully sates:
| Note that gpio_get*_optional() functions (and their managed variants), unlike
| the rest of gpiolib API, also return NULL when gpiolib support is disabled.
| This is helpful to driver authors, since they do not need to special case
| -ENOSYS return codes.  System integrators should however be careful to enable
| gpiolib on systems that need it.

I cannot find this paragraph in Documentation/gpio/consumer.txt:

        $ git grep -e 'ENOSYS' v4.11-rc3 -- Documentation/gpio/
        <void>

It was added by commit 22c403676dbbb7c6 ("gpio: return NULL from
gpiod_get_optional when GPIOLIB is disabled")

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds