[alsa-devel] [PATCH] pinctrl: lochnagar: select GPIOLIB

[Richard Fitzgerald]

On 07/01/2020 10:39, Arnd Bergmann wrote:
> On Tue, Jan 7, 2020 at 10:45 AM Linus Walleij <linus.walleij at linaro.org> wrote:
>> On Wed, Dec 18, 2019 at 5:37 PM Arnd Bergmann <arnd at arndb.de> wrote:
>>> I wonder if GPIOLIB should just become mandatory when enabling the pinctrl
>>> subsystem, or if there are still good reasons for leaving it disabled
>>> on any machine that uses CONFIG_PINCTRL.
>>
>> Hm that is a tricky question, they almost always come in pair but are
>> technically speaking separate subsystems.
> 
> I think there are a number of use cases for GPIOLIB drivers without PINCTRL, but
> are there any examples of the reverse?
> 
>         Arnd
> 

You could have muxable pins that aren't gpios. For example muxing 
between i2c/spi signals. So a pinctrl driver doesn't imply gpio.