xref: /linux/Documentation/devicetree/bindings/watchdog/realtek,otto-wdt.yaml (revision 5c68005083d620b1499fc81926a514d39ae8b88c) 
1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/watchdog/realtek,otto-wdt.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Realtek Otto watchdog timer
8
9maintainers:
10  - Sander Vanheule <sander@svanheule.net>
11
12description: |
13  The timer has two timeout phases. Both phases have a maximum duration of 32
14  prescaled clock ticks, which is ca. 43s with a bus clock of 200MHz. The
15  minimum duration of each phase is one tick. Each phase can trigger an
16  interrupt, although the phase 2 interrupt will occur with the system reset.
17  - Phase 1: During this phase, the WDT can be pinged to reset the timeout.
18  - Phase 2: Starts after phase 1 has timed out, and only serves to give the
19    system some time to clean up, or notify others that it's going to reset.
20    During this phase, pinging the WDT has no effect, and a reset is
21    unavoidable, unless the WDT is disabled.
22
23allOf:
24  - $ref: watchdog.yaml#
25
26properties:
27  compatible:
28    enum:
29      - realtek,rtl8380-wdt
30      - realtek,rtl8390-wdt
31      - realtek,rtl9300-wdt
32      - realtek,rtl9310-wdt
33
34  reg:
35    maxItems: 1
36
37  clocks:
38    maxItems: 1
39
40  interrupts:
41    items:
42      - description: interrupt specifier for pretimeout
43      - description: interrupt specifier for timeout
44
45  interrupt-names:
46    items:
47      - const: phase1
48      - const: phase2
49
50  realtek,reset-mode:
51    $ref: /schemas/types.yaml#/definitions/string
52    description: |
53      Specify how the system is reset after a timeout. Defaults to "cpu" if
54      left unspecified.
55    oneOf:
56      - description: Reset the entire chip
57        const: soc
58      - description: |
59          Reset the CPU and IPsec engine, but leave other peripherals untouched
60        const: cpu
61      - description: |
62          Reset the execution pointer, but don't actually reset any hardware
63        const: software
64
65required:
66  - compatible
67  - reg
68  - clocks
69  - interrupts
70  - interrupt-names
71
72unevaluatedProperties: false
73
74examples:
75  - |
76    watchdog: watchdog@3150 {
77        compatible = "realtek,rtl8380-wdt";
78        reg = <0x3150 0xc>;
79
80        realtek,reset-mode = "soc";
81
82        clocks = <&lxbus_clock>;
83        timeout-sec = <20>;
84
85        interrupt-parent = <&rtlintc>;
86        interrupt-names = "phase1", "phase2";
87        interrupts = <19>, <18>;
88    };
89
90...
91