host->ios.bus_width = MMC_BUS_WIDTH_1;
static void mmc_power_off(struct mmc_host *host){	host->ios.clock = 0;	host->ios.vdd = 0;	host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;	host->ios.chip_select = MMC_CS_DONTCARE;	host->ios.power_mode = MMC_POWER_OFF;	host->ops->set_ios(host, &host->ios);}