Pullup is used by the usb framework in order to do software-controlled
usb_gadget_connect() and usb_gadget_disconnect().
Implement pullup() for dwc2 using the SOFT_DISCONNECT bit in the dctl
register:
* when pullup is on, clear SOFT_DISCONNECT
* when pullup is off, set SOFT_DISCONNECT
This is especially useful when a gadget disconnection is initiated but
no board_usb_cleanup() is called.
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
2383e8f4ae