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Add support for adding GPIs to the event FIFO. This is done by adding irq_chip support. Like this, one can use the input gpio_keys driver as a "frontend" device and input handler. As part of this change, we now implement .request() and .free() as we can't blindly consume all available pins as GPIOs (example: some pins can be used for forming a keymap matrix). Also note that the number of pins can now be obtained from the parent, top level device. Hence the 'max_gpio' variable can be removed. Reviewed-by: Linus Walleij <[email protected]> Acked-by: Bartosz Golaszewski <[email protected]> Signed-off-by: Nuno Sá <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Lee Jones <[email protected]>