On Tue, Jan 7, 2020 at 12:58 PM Richard Fitzgerald rf@opensource.cirrus.com wrote:
On 07/01/2020 10:39, Arnd Bergmann wrote:
On Tue, Jan 7, 2020 at 10:45 AM Linus Walleij linus.walleij@linaro.org wrote:
On Wed, Dec 18, 2019 at 5:37 PM Arnd Bergmann arnd@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?
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.
Arnd