Enable 9bit-mode in a serial device

Jorge Fernandez Monteagudo jorgefm at cirsa.com
Mon Feb 22 03:21:47 EST 2021

Hi all,

I'm wondering what's the best way to enable the 9bit-mode for a given tty serial device. I have a motherboard with a NCT6102D Nuvoton super IO with 6 UARTs.
This device is supported by the 8250/16550 driver already in kernel and I'm able to communicate two serial port with a NULL modem cable.

>From NCT6102D Nuvoton datasheet it seems some bits has to be set in order to enable this mode to use the parity bit as the 9 bit.

Any hint? Any driver from drivers/tty/serial/8250 can be used as a guide? Some user space code can be used to get access to registers?

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