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airoha: an7581: enable uart baudrate control

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The baud rate control on Airoha does not function properly. This
patch enables the inactive code responsible for this. The UART2
baud rate is correct. HSUART3 operates at twice the requested
baud rate. The same problem exists in the current code, so this
doesn't introduce any regression. Support for baud rates higher
than 460800 is still required. This will be added in the future.

Tested on Gemtek W1700k. UART2 and HSUART3 are working fine.

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Link: https://github.com/openwrt/openwrt/pull/20049
Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit 440b85f5b1)
[ solve conflict error ]
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
This commit is contained in:
Aleksander Jan Bajkowski 2025-09-14 17:38:24 +02:00 • committed by Christian Marangi
parent dc11868486
commit f364fe5e09
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2 changed files with 20 additions and 0 deletions
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1
target/linux/airoha/an7581/config-6.6
View file

@ -517,6 +517,7 @@ CONFIG_SECURITY=y
CONFIG_SECURITYFS=y
# CONFIG_SECURITY_DMESG_RESTRICT is not set
# CONFIG_SECURITY_NETWORK is not set
CONFIG_SERIAL_8250_AIROHA=y
CONFIG_SERIAL_8250_EXTENDED=y
CONFIG_SERIAL_8250_FSL=y
CONFIG_SERIAL_8250_NR_UARTS=5

19
target/linux/airoha/patches-6.6/105-uart-add-en7523-support.patch
View file

@ -135,6 +135,25 @@
/*
* LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR
* is written without DLAB set, this mode will be disabled.
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -354,6 +354,16 @@ config SERIAL_8250_ACORN
system, say Y to this option. The driver can handle 1, 2, or 3 port
cards. If unsure, say N.
+config SERIAL_8250_AIROHA
+ tristate "Airoha UART support"
+ depends on (ARCH_AIROHA || COMPILE_TEST) && OF && SERIAL_8250
+ help
+ Selecting this option enables an Airoha SoC specific baud rate
+ calculation routine on an otherwise 16550 compatible UART hardware.
+
+ If you have an Airoha based board and want to use the serial port,
+ say Y to this option. If unsure, say N.
+
config SERIAL_8250_BCM2835AUX
tristate "BCM2835 auxiliar mini UART support"
depends on ARCH_BCM2835 || COMPILE_TEST
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_SERIAL_8250_PERICOM) += 825