Axi Watchdog
Introduction
This page describes the AXI WDT/Window watchdog driver which is available in mainline and Xilinx Linux distribution asdrivers/watchdog/of_xilinx_wdt.c
HW IP Features
- Connects as a 32-bit slave on a AXI4-Lite interface
- Watchdog timer with selectable timeout period and interrupt
- Configurable WDT enable: enable-once or enable-repeatedly
- One 32-bit free-running timebase counter with rollover interrupt-dual control register
- Generic watchdog timer feature implemented.
Known Issues and Limitations
- The current driver does not support the Axi Window watchdog feature.
Kernel Configuration
The following config options should be enabled in order to build the xilinx watchdog driver:CONFIG_XILINX_WATCHDOG
CONFIG_WATCHDOG
¦ Symbol: XILINX_WATCHDOG [=y] ¦ ¦ Type : tristate ¦ ¦ Prompt: Xilinx Watchdog timer ¦ ¦ Location: ¦ ¦ -> Device Drivers ¦ ¦ (4) -> Watchdog Timer Support (WATCHDOG [=y]) ¦ ¦ Defined at drivers/watchdog/Kconfig:171 ¦ ¦ Depends on: WATCHDOG [=y] && HAS_IOMEM [=y] ¦ ¦ Selects: WATCHDOG_CORE [=y]
Devicetree
For more details, please referDocumentation/devicetree/bindings/watchdog/of-xilinx-wdt.txt
Example:
watchdog { compatible = "xlnx,xps-timebase-wdt-1.0.a"; reg = <0x42600000 0x1000>; xlnx-wdt-enable-once = <0>; xlnx-wdt-interval = <0x1b>; };
Test procedure
Change the parameters using IOCTLs and see if reported values is correct.# /bin/wdt_app /dev/watchdog1
The timeout was is 42 seconds
root@uart:~#
Mainline Status
- This driver is currently in sync with the mainline kernel.
Change Log
2024.2
- None
2024.1
- Summary
- watchdog: of_xilinx_wdt: Remove unnecessary clock disable call in the remove path
- Commits
- Summary
2023.2
2023.1
- Summary
- watchdog: of_xilinx_wdt: Update maximum timeout value based on ref clock
- Commits
- Summary
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