On Wed, Oct 29, 2025 at 12:21 PM Bartosz Golaszewski <[email protected]> wrote:
> From: Bartosz Golaszewski <[email protected]> > > Add a virtual GPIO proxy driver which arbitrates access to a single > shared GPIO by multiple users. It works together with the core shared > GPIO support from GPIOLIB and functions by acquiring a reference to a > shared GPIO descriptor exposed by gpiolib-shared and making sure that > the state of the GPIO stays consistent. > > In general: if there's only one user at the moment: allow it to do > anything as if this was a normal GPIO (in essence: just propagate calls > to the underlying real hardware driver). If there are more users: don't > allow to change the direction set by the initial user, allow to change > configuration options but warn about possible conflicts and finally: > treat the output-high value as a reference counted, logical "GPIO > enabled" setting, meaning: the GPIO value is set to high when the first > user requests it to be high and back to low once the last user stops > "voting" for high. > > Signed-off-by: Bartosz Golaszewski <[email protected]> With same reasoning as for 3/10: Reviewed-by: Linus Walleij <[email protected]> Yours, Linus Walleij
