some questions about usb_serial_probe

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Dear all:
in usb_serial_probe, we create tty_port based on max_endpoints.
My questions are:
1. some callback functions, such serial_hangup, serial_carrier_raised,
etc. will called by tty layer with different tty_ports.
how tty layer know these tty_ports?
I only found tty_port_init to initial these tty_ports, but where we
register these tty_ports to tty layer?

-- 
Regards,
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