How to enable all 3 usb3.0 ports of TX2 based on R28.1 sample code?

We want to enable all 3 usb3.0 ports on TX2. But the sample code just support one usb3.0 on port#0.
According to the “JetsonTX2/TX2i OEM PRODUCT DESIGN GUIDE”, Chapter 5.0, config#4 will enable 4 usb3.0, but config#1 & #2 are avalidated in the sample code.
What should I to enable the config#4 for 3 usb3.0 ports?
Thanks very much for any help!

Please also refer to tx2 adaptation guide.

Thanks! I’ll check it.

There are also some practical example for you