UART question

[Vincent DEFERT <vincent.defert%posteo.net@localhost>]

While I'm at it, one more question on the ODROID C2's UARTs.

I have modified the DTB to enable uart_A in addition to the default uart_AO.
dmesg sees it:

[     1.000004] mesonuart0 at simplebus4
[     1.000004] mesonuart0: interrupting on GIC irq 58
[     1.000004] mesonuart1 at simplebus6: console
[     1.000004] mesonuart1: interrupting on GIC irq 225

mesonuart0 is uart_A (or UART0 as per the data sheet)
mesonuart1 is uart_AO (or UART0-AO in the data sheet)

I can talk to mesonuart1 through /dev/constty, but none of the /dev/tty* 
is associated to mesonuart0.
When I try to echo something to them, I get the following error:
cannot create /dev/tty00: no such device or address

Is there something special I should do to bind mesonuart0 to a device 
under /dev?