musb-sunxi 1c19000.usb: Invalid or missing 'dr_mode' property

Looks like usb gadget can't currently be used because of the missing dr_mode property:

[    3.879285] musb-sunxi 1c19000.usb: Invalid or missing 'dr_mode' property
[    3.886194] musb-sunxi: probe of 1c19000.usb failed with error -22