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The need for reset GPIOs has several times been pointed out from erlier posted patchsets. Especially some WLAN chips which are attached to an SDIO interface may use a GPIO reset. The reset GPIO is asserted at initialization and prior we start the power up procedure. The GPIO will be de-asserted right after the power has been provided to the card, from the ->post_power_on() callback. Note, the reset GPIO is optional. Thus we don't return an error even if we can't find a GPIO for the consumer. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>