When USB 3 is enabled on COMPHY lane 2 it's PHY registers are accessed via an indirect addressing mechanism. The polling code in mvebu_a3700_comphy_usb3_power_on() trying to do this tries to read from a bogus address and hangs.
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My patch was a duplicate of https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/2198, so I dropped #2205.