Charles,
There is information from the Data Sheet that should be relevant:
"For information on implementation of SmartReflex see the Power Management for KeyStone Devices application report and the Hardware Design Guide for KeyStone Devices (SPRABI2) in ‘‘Related Documentation from Texas Instruments’’ on page 73 of the Data Sheet."
Have you seen this? Another place to look for information would be the PMIC used on the C6678 EVM.
Regards.