dev_pm_opp_get_required_pstate
pstate = dev_pm_opp_get_required_pstate(opp, 0);
pstate = dev_pm_opp_get_required_pstate(opp, 0);
EXPORT_SYMBOL_GPL(dev_pm_opp_get_required_pstate);
unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,