mmc: sdhci-dove: allow GPIOs to be used for card detection on Dove
This commit taken from Rabeeh's Cubox kernel and re-worked for DT; Sebastian Hasselbrath is believed to be the original author. Some Cuboxes require a GPIO for card detection; this implements the optional GPIO support for card detection. This GPIO is logic 0 for card inserted. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: NChris Ball <cjb@laptop.org>
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