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Some pinctrl drivers can use the gpiochip irq valid information to figure out if certain gpios are exposed to the kernel for usage or not. Expose this API so we can use it in the pinmux_ops::request ops. Signed-off-by: Stephen Boyd <[email protected]> Acked-by: Bjorn Andersson <[email protected]> Signed-off-by: Linus Walleij <[email protected]>