pm_busop_set_power
ret = pm_busop_set_power(dip, NULL, BUS_POWER_CHILD_PWRCHG,
static int pm_busop_set_power(dev_info_t *,
ret = pm_busop_set_power(cdip, impl_arg, op, arg,
ret = pm_busop_set_power(dip, impl_arg, BUS_POWER_CHILD_PWRCHG,