| .. SPDX-License-Identifier: GPL-2.0+: | |
| .. index:: | |
| single: wdt (command) | |
| wdt command | |
| =========== | |
| Synopsis | |
| -------- | |
| :: | |
| wdt list | |
| wdt dev [<name>] | |
| wdt start <timeout_ms> [flags] | |
| wdt stop | |
| wdt reset | |
| wdt expirer [flags] | |
| Description | |
| ----------- | |
| The wdt command is used to control watchdog timers. | |
| The 'wdt list' command shows a list of all watchdog devices. | |
| The 'wdt dev' command called without argument shows the current watchdog device. | |
| The current device is set when passing the name of the device as argument. | |
| The 'wdt start' command starts the current watchdog timer. | |
| The 'wdt stop' command stops the current watchdog timer. | |
| The 'wdt reset' command resets the current watchdog timer without stopping it. | |
| The 'wdt expire' command let's the current watchdog timer expire immediately. | |
| This will lead to a reset. | |
| name | |
| name of the watchdog device | |
| timeout_ms | |
| timeout interval in milliseconds | |
| flags | |
| unsigned long value passed to the driver. The usage is driver specific. | |
| The value is ignored by most drivers. | |
| Example | |
| ------- | |
| :: | |
| => wdt dev | |
| No watchdog timer device set! | |
| => wdt list | |
| watchdog@1c20ca0 (sunxi_wdt) | |
| => wdt dev watchdog@1c20ca0 | |
| => wdt dev | |
| dev: watchdog@1c20ca0 | |
| => wdt start 3000 | |
| => wdt reset | |
| => wdt stop | |
| => wdt expire | |
| U-Boot SPL 2022.04-rc3 (Mar 25 2022 - 13:48:33 +0000) | |
| In the example above '(sunxi_wdt)' refers to the driver for the watchdog | |
| device. | |
| Configuration | |
| ------------- | |
| The command is only available if CONFIG_CMD_WDT=y. | |
| Return value | |
| ------------ | |
| The return value $? is 0 if the command succeeds, 1 upon failure. |