Re: [PATCH] pinctrl: lochnagar: select GPIOLIB
From: Arnd Bergmann
Date: Tue Jan 07 2020 - 07:39:11 EST
On Tue, Jan 7, 2020 at 12:58 PM Richard Fitzgerald
> On 07/01/2020 10:39, Arnd Bergmann wrote:
> > On Tue, Jan 7, 2020 at 10:45 AM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:
> >> On Wed, Dec 18, 2019 at 5:37 PM Arnd Bergmann <arnd@xxxxxxxx> 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?
> You could have muxable pins that aren't gpios. For example muxing
> between i2c/spi signals. So a pinctrl driver doesn't imply gpio.
I understand that this is the case in theory, but what I was wondering about
is whether there are any such users, or at least any that also want to
save a few kilobytes of kernel size for gpiolib.