Path: blob/master/Documentation/ABI/testing/configfs-usb-gadget-serial
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What: /config/usb-gadget/gadget/functions/gser.name Date: Jun 2013 KernelVersion: 3.11 Description: This item contains just one readonly attribute: port_num. It contains the port number of the /dev/ttyGS<n> device associated with gser function's instance "name".