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serial: 8250: 6.18: add UPIO_AU case to set_io_from_upio()

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This patch fixes the "Unsupported UART type 4" error by adding support
for the UPIO_AU I/O type in set_io_from_upio() (used by Au1x00 and
RT288x). It assigns the correct serial input/output functions
(io_serial_in, io_serial_out) for proper operation when UPIO_AU is
configured.

Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
Link: https://github.com/openwrt/openwrt/pull/21078
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Mieczyslaw Nalewaj 2026-01-18 15:24:46 +01:00 committed by Robert Marko
parent 9a0a5ce89b
commit a9fe8ba129
1 changed files with 25 additions and 0 deletions
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target/linux/generic/hack-6.18/890-serial-8250-add-UPIO_AU-case-to-set_io_from_upio.patch Normal file
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@ -0,0 +1,25 @@
From: Mieczyslaw Nalewaj <namiltd@yahoo.com>
Date: Sun, 18 Jan 2026 15:24:46 +0100
Subject: [PATCH] serial: 8250: add UPIO_AU case to set_io_from_upio()
This patch fixes the "Unsupported UART type 4" error by adding support
for the UPIO_AU I/O type in set_io_from_upio() (used by Au1x00 and
RT288x). It assigns the correct serial input/output functions
(io_serial_in, io_serial_out) for proper operation when UPIO_AU is
configured.
Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
---
drivers/tty/serial/8250/8250_port.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -454,6 +454,7 @@ static void set_io_from_upio(struct uart
break;
#ifdef CONFIG_HAS_IOPORT
case UPIO_PORT:
+ case UPIO_AU:
p->serial_in = io_serial_in;
p->serial_out = io_serial_out;
break;