Where should I search for their corresponding relationship?
USB0 is usb2-0 in device tree.
USB1 is usb2-1. USB2 is usb2-2.
What about the others, usb3-0,3-1 3-2
You could refer to the design guide document. It will tell. P0 means usb3-0. P1 means usb3-1… etc.
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