gpio: xlp: Convert to immutable irq_chip
Convert the driver to immutable irq-chip with a bit of intuition. In this case the driver uses .mask_ack() and .unmask() and since I have a vague idea about the semantics of .mask_ack() I added .irq_enable() to the existing .irq_disable() and called into the gpiolib core from those callbacks instead of mask/unmask. Cc: Marc Zyngier <maz@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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