Cutting down power is more of a manual thing. You can use bind/unbind to remove the drive and then even go into low power mode if you want (or, theortically go from host to device like in on-thr-go). If you really need to lower the power usage of the chip, you can shut off the clock to the USB peripheral, or shut down the external 48MHz clock. But...that is still only after you unbind the driver via the sysfs interface.
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