> I thought it just required that the uart driver call
quoted text
> uart_handle_dcd_change when the state of the CD changes, and all the PPS
> stuff happened in that function.

uart_ is only used by some drivers. We have a whole army of drivers using
the tty layer directly and another army of drivers using the USB layer.

You also need a sensible way to talk to the devices, identify support and
avoid clashing uses of carrier pins.

Alan
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