regulator_request_power_budget
ret = regulator_request_power_budget(supply, pw_budget);
ret = regulator_request_power_budget(pi->pw_d->supply, pw_diff);
while (regulator_request_power_budget(pi->pw_d->supply, pw_req) == -ERANGE) {
ret = regulator_request_power_budget(rdev->supply, pw_req);
EXPORT_SYMBOL_GPL(regulator_request_power_budget);
int regulator_request_power_budget(struct regulator *regulator,