1# Software watchdog configuration
2
3# Copyright (c) 2020 Libre Solar Technologies GmbH
4# SPDX-License-Identifier: Apache-2.0
5
6menuconfig TASK_WDT
7	bool "Task-level software watchdog"
8	select REBOOT
9	help
10	  Enable task watchdog
11
12	  The task watchdog allows to have individual watchdog channels
13	  per thread, even if the hardware supports only a single watchdog.
14
15config TASK_WDT_CHANNELS
16	int "Maximum number of task watchdog channels"
17	depends on TASK_WDT
18	default 5
19	range 2 100
20	help
21	  The timeouts for each channel are stored in an array. Allocate only
22	  the required amount of channels to reduce memory footprint.
23
24config TASK_WDT_HW_FALLBACK
25	bool "Use hardware watchdog as a fallback"
26	depends on TASK_WDT
27	default y
28	help
29	  This option allows to specify a hardware watchdog device in the
30	  application that is used as an additional safety layer if the task
31	  watchdog itself gets stuck.
32
33config TASK_WDT_MIN_TIMEOUT
34	int "Minimum timeout for task watchdog (ms)"
35	depends on TASK_WDT_HW_FALLBACK
36	default 100
37	range 1 10000
38	help
39	  The task watchdog uses a continuously restarted k_timer as its
40	  backend. This value specifies the minimum timeout in milliseconds
41	  among all task watchdogs used in the application.
42
43	  If a hardware watchdog is configured as a fallback for the task
44	  watchdog, its timeout is set to this value plus
45	  TASK_WDT_HW_FALLBACK_DELAY.
46
47config TASK_WDT_HW_FALLBACK_DELAY
48	int "Additional delay for hardware watchdog (ms)"
49	depends on TASK_WDT_HW_FALLBACK
50	default 20
51	range 1 1000
52	help
53	  The timeout of the hardware watchdog fallback will be increased by
54	  this value to provide sufficient time for corrective actions in the
55	  callback function.
56
57	  In addition to that, the delay allows to compensate deviations
58	  between different clock sources for the hardware watchdog and the
59	  kernel timer. This is especially important if the hardware watchdog
60	  is clocked by an inaccurate low-speed RC oscillator.
61