DCP : Dedicated Charging Port
CDP : Charging Downstream Port
DCP
- Strictly for power only
- No need host connection
- No data transfer
CDP
- Can transfer data
- Up to 1.5A to USB Peripheral devices
DRD : Dual Role Device
[Reference]
http://www.sealevel.com/support/article/AA-00535/0/What-is-the-difference-between-a-battery-charging-USB-port-and-a-standard-USB-port.html
DRD
https://e2e.ti.com/support/arm/automotive_processors/f/1020/t/590325