From c6807970c3bc0aa80f4804fc7d38b32f99fc3cf6 Mon Sep 17 00:00:00 2001 From: Chia-Wei Wang Date: Fri, 22 Oct 2021 10:36:16 +1030 Subject: 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 Signed-off-by: Chia-Wei Wang Signed-off-by: Joel Stanley Tested-by: Lei YU 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 --- .../ABI/testing/sysfs-driver-aspeed-uart-routing | 27 ++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-driver-aspeed-uart-routing (limited to 'Documentation/ABI') diff --git a/Documentation/ABI/testing/sysfs-driver-aspeed-uart-routing b/Documentation/ABI/testing/sysfs-driver-aspeed-uart-routing new file mode 100644 index 000000000000..b363827da437 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-aspeed-uart-routing @@ -0,0 +1,27 @@ +What: /sys/bus/platform/drivers/aspeed-uart-routing/*/uart* +Date: September 2021 +Contact: Oskar Senft + Chia-Wei Wang +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 + Chia-Wei Wang +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 -- cgit v1.2.3