regulator_status
rv = regulator_status(sc->mmc_helper.vmmc_supply, ®_status);
rv = regulator_status(sc->mmc_helper.vqmmc_supply, ®_status);
rv = regulator_status(sc->mmc_helper.vmmc_supply, ®_status);
rv = regulator_status(sc->mmc_helper.vqmmc_supply, ®_status);
rv = regulator_status(helper->vmmc_supply, ®_status);
rv = regulator_status(helper->vqmmc_supply, ®_status);
rv = regulator_status(helper->vmmc_supply, ®_status);
rv = regulator_status(helper->vqmmc_supply, ®_status);
error = regulator_status(sc->power_supply, ®_status);
int regulator_status(regulator_t reg, int *status);