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Add function to support getting voltage from device-tree. If voltage-range is specified in device-tree node, this function will parse it and return the available voltage mask. Signed-off-by: Haijun Zhang <haijun.zhang@freescale.com> Acked-by: Anton Vorontsov <anton@enomsg.org> Signed-off-by: Chris Ball <cjb@laptop.org> Conflicts: drivers/mmc/core/core.c