regulator_get_current_limit
int curr = regulator_get_current_limit(mmc->supply.vqmmc2);
int curr = regulator_get_current_limit(mmc->supply.vmmc);
curr = regulator_get_current_limit(rockchip->vpcie3v3);
EXPORT_SYMBOL_GPL(regulator_get_current_limit);
current_uA = regulator_get_current_limit(vbus_supply);
int regulator_get_current_limit(struct regulator *regulator);