regulator_set_voltage
err = regulator_set_voltage(sc->mmc_helper.vqmmc_supply, uvolt, uvolt);
rv = regulator_set_voltage(sc->supply_vdd_cpu,
rv = regulator_set_voltage(sc->supply_vdd_cpu,
error = regulator_set_voltage(sc->reg,
error = regulator_set_voltage(sc->reg,
error = regulator_set_voltage(sc->reg,
int regulator_set_voltage(regulator_t reg, int min_uvolt, int max_uvolt);
err = regulator_set_voltage(vqmmc_supply, uvolt, uvolt);
err = regulator_set_voltage(sc->vqmmc_supply,
err = regulator_set_voltage(sc->vqmmc_supply,