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To automatically enable GPIO functionality of some MPP pin, it is required to implement .gpio_request_enable and .gpio_disable_free callbacks in pinctrl driver and set .request and .rfree callbacks in GPIO driver to pinctrl_gpio_request / pinctrl_gpio_free functions. Signed-off-by: Pali Rohár <pali@kernel.org> Reviewed-by: Stefan Roese <sr@denx.de>