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c6807970c3
linux-yocto/Documentation/ABI/testing/sysfs-driver-aspeed-uart-routing
Chia-Wei Wang c6807970c3
soc: aspeed: Add UART routing support 
Add driver support for the UART routing control. Users can perform
runtime configuration of the RX muxes among the UART controllers and
the UART IO pins.

The sysfs interface is also exported for the convenience of routing paths
check and update.

Signed-off-by: Oskar Senft <osk@google.com>
Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Tested-by: Lei YU <yulei.sh@bytedance.com>
Link: https://lore.kernel.org/r/20210927023053.6728-5-chiawei_wang@aspeedtech.com
Link: https://lore.kernel.org/r/20211022000616.481772-1-joel@jms.id.au'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2021-10-22 17:32:09 +02:00

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What: /sys/bus/platform/drivers/aspeed-uart-routing//uart Date: September 2021 Contact: Oskar Senft osk@google.com Chia-Wei Wang chiawei_wang@aspeedtech.com Description: Selects the RX source of the UARTx device.

	When read, each file shows the list of available options with currently
	selected option marked by brackets "[]". The list of available options
	depends on the selected file.

	e.g.
	cat /sys/bus/platform/drivers/aspeed-uart-routing/*.uart_routing/uart1
	[io1] io2 io3 io4 uart2 uart3 uart4 io6

	In this case, UART1 gets its input from IO1 (physical serial port 1).

Users: OpenBMC. Proposed changes should be mailed to openbmc@lists.ozlabs.org

What: /sys/bus/platform/drivers/aspeed-uart-routing//io Date: September 2021 Contact: Oskar Senft osk@google.com Chia-Wei Wang chiawei_wang@aspeedtech.com Description: Selects the RX source of IOx serial port. The current selection will be marked by brackets "[]". Users: OpenBMC. Proposed changes should be mailed to openbmc@lists.ozlabs.org