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lib: utils/serial: Add support for Altera JTAG UART

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Altera provides a JTAG UART core that provides virtual UART over JTAG
and can coexist with their virtual JTAG. [1] This core has already been
supported by Linux and the programming interface has always been stable.

Add support for it to OpenSBI to ease JTAG prototype bringing up.

The driver follows the device tree binding in mainline Linux. [2]

[1] https://docs.altera.com/r/docs/683130/25.3/embedded-peripherals-ip-user-guide/jtag-uart-core
[2] https://github.com/torvalds/linux/blob/v6.19-rc1/Documentation/devicetree/bindings/serial/altr%2Cjuart-1.0.yaml

Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260104065506.70182-1-zhengxingda@iscas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Icenowy Zheng
2026-01-04 14:55:06 +08:00
committed by Anup Patel
parent ecdb6c90c8
commit b07e449d15
6 changed files with 145 additions and 0 deletions
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9
lib/utils/serial/Kconfig
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@@ -9,6 +9,11 @@ config FDT_SERIAL
if FDT_SERIAL
config FDT_SERIAL_ALTR_JUART
bool "Altera JTAG UART FDT driver"
select SERIAL_ALTR_JUART
default n
config FDT_SERIAL_CADENCE
bool "Cadence UART FDT driver"
select SERIAL_CADENCE
@@ -56,6 +61,10 @@ config FDT_SERIAL_XILINX_UARTLITE
endif
config SERIAL_ALTR_JUART
bool "Altera JTAG UART support"
default n
config SERIAL_CADENCE
bool "Cadence UART support"
default n