Re: [PATCH 05/10] ldisc: new dcd_change() method for linedisciplines.

[Alan Cox]

> + * 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
mystery.
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