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The gpio_base field is used to specify the desired GPIO base for the GPIO controller. The GPIO core can automatically allocate a GPIO number range when the base is set to -1. To make this possible, make the field signed. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>