gpio: ws16c48: Make irq_chip immutable
Kernel warns about mutable irq_chips: "not an immutable chip, please consider fixing!" Make the struct irq_chip const, flag it as IRQCHIP_IMMUTABLE, add the new helper functions, and call the appropriate gpiolib functions. Signed-off-by: NWilliam Breathitt Gray <william.gray@linaro.org> Signed-off-by: NBartosz Golaszewski <brgl@bgdev.pl>
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