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Add a function that allows initializing the valid_mask from gpiochip_add_data. This prevents race conditions during gpiochip initialization. If the function is not exported, then the old behaviour is respected, this is, set all gpios as valid. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Tested-by: Jeffrey Hugo <jhugo@codeaurora.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>