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SubjectRe: [PATCH 05/10] ldisc: new dcd_change() method for line disciplines.
> + * void (*dcd_change)(struct uart_port *port, unsigned int status,
> + * struct timespec *ts)
> + *
> + * Tells the discipline that the DCD pin has changed its status and
> + * the relative timestamp. Pointer ts can be NULL.
> */

uart_port is a specific property of a few random types of interface, pass
a tty struct up. Otherwise looks fine. Might one day expand it to a more
generic change type and pass info on what changed but thats a future

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