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serial: 8250_port: recognize UPIO_AU

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My MIPS Alchemy systems generate the following warning during
probe of the 8250 driver:

WARNING: drivers/tty/serial/8250/8250_port.c:462 at set_io_from_upio+0xfc/0x124, CPU#0: swapper/0/1
Unsupported UART type 4
[...]
[<80521d40>] set_io_from_upio+0xfc/0x124
[<80521dfc>] serial8250_set_defaults+0x94/0xe0
[<80520fb4>] serial8250_register_8250_port+0x288/0x51c
[<805214ec>] serial8250_probe+0x160/0x1e8
[<8053b5f0>] platform_probe+0x64/0x90

The least invasive fix is to recognize UPIO_AU (type 4) in set_io_from_upio()
and do nothing, since all parameters have already been set up in
8250_rt288x.c::au_platform_setup().

Run-tested on Alchemy Au1300 platform.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Link: https://patch.msgid.link/20260430135822.905035-1-manuel.lauss@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manuel Lauss
2026-04-30 15:58:22 +02:00
committed by Greg Kroah-Hartman
parent a23907d034
commit 49fa670efd
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/8250/8250_port.c
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@@ -458,6 +458,8 @@ static void set_io_from_upio(struct uart_port *p)
p->serial_out = io_serial_out;
break;
#endif
case UPIO_AU:
break;
default:
WARN(p->iotype != UPIO_PORT || p->iobase,
"Unsupported UART type %x\n", p->iotype);