Describe the wdt command.
Signed-off-by: Heinrich Schuchardt heinrich.schuchardt@canonical.com --- doc/usage/index.rst | 1 + doc/usage/wdt.rst | 77 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 78 insertions(+) create mode 100644 doc/usage/wdt.rst
diff --git a/doc/usage/index.rst b/doc/usage/index.rst index 0aacf531b2..630a6cb28a 100644 --- a/doc/usage/index.rst +++ b/doc/usage/index.rst @@ -52,3 +52,4 @@ Shell commands size true ums + wdt diff --git a/doc/usage/wdt.rst b/doc/usage/wdt.rst new file mode 100644 index 0000000000..8d80433c1f --- /dev/null +++ b/doc/usage/wdt.rst @@ -0,0 +1,77 @@ +.. SPDX-License-Identifier: GPL-2.0+: + +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.