fdtbus_regulator_get_voltage
error = fdtbus_regulator_get_voltage(tegra124_reg_vddcpu, &cur_uvol);
error = fdtbus_regulator_get_voltage(sc->sc_pin_supply[index], &uvol);
error = fdtbus_regulator_get_voltage(sc->sc_supply, &sc->sc_vref);
error = fdtbus_regulator_get_voltage(sc->sc_supply, &old_uv);
int fdtbus_regulator_get_voltage(struct fdtbus_regulator *,
error = fdtbus_regulator_get_voltage(sc->sc_vref_supply, &uvolts);