It took a little digging, but the only two references that Sony makes to the mysterious port are on the online PS4 User's Guide and the instruction manual for the official DualShock 4 charging ...

With a wired connection, you can game for a much longer period because you can steadily charge your controller at the same ...

Make sure you don’t get scuppered at the final blow in a long boss fight by getting yourself the DualShock 4 Charging Station. This dinky little gadget will charge two controllers at once in a ...