xref: /linux/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml (revision 4b660dbd9ee2059850fd30e0df420ca7a38a1856) 
1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/watchdog/samsung-wdt.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Samsung SoC Watchdog Timer Controller
8
9maintainers:
10  - Krzysztof Kozlowski <krzk@kernel.org>
11
12description: |+
13  The Samsung's Watchdog controller is used for resuming system operation
14  after a preset amount of time during which the WDT reset event has not
15  occurred.
16
17properties:
18  compatible:
19    oneOf:
20      - enum:
21          - google,gs101-wdt                      # for Google gs101
22          - samsung,s3c2410-wdt                   # for S3C2410
23          - samsung,s3c6410-wdt                   # for S3C6410, S5PV210 and Exynos4
24          - samsung,exynos5250-wdt                # for Exynos5250
25          - samsung,exynos5420-wdt                # for Exynos5420
26          - samsung,exynos7-wdt                   # for Exynos7
27          - samsung,exynos850-wdt                 # for Exynos850
28          - samsung,exynosautov9-wdt              # for Exynosautov9
29      - items:
30          - enum:
31              - tesla,fsd-wdt
32          - const: samsung,exynos7-wdt
33
34  reg:
35    maxItems: 1
36
37  clocks:
38    minItems: 1
39    maxItems: 2
40
41  clock-names:
42    minItems: 1
43    maxItems: 2
44
45  interrupts:
46    maxItems: 1
47
48  samsung,cluster-index:
49    $ref: /schemas/types.yaml#/definitions/uint32
50    description:
51      Index of CPU cluster on which watchdog is running (in case of Exynos850
52      or Google gs101).
53
54  samsung,syscon-phandle:
55    $ref: /schemas/types.yaml#/definitions/phandle
56    description:
57      Phandle to the PMU system controller node (in case of Exynos5250,
58      Exynos5420, Exynos7, Exynos850 and gs101).
59
60required:
61  - compatible
62  - clocks
63  - clock-names
64  - interrupts
65  - reg
66
67allOf:
68  - $ref: watchdog.yaml#
69  - if:
70      properties:
71        compatible:
72          contains:
73            enum:
74              - google,gs101-wdt
75              - samsung,exynos5250-wdt
76              - samsung,exynos5420-wdt
77              - samsung,exynos7-wdt
78              - samsung,exynos850-wdt
79              - samsung,exynosautov9-wdt
80    then:
81      required:
82        - samsung,syscon-phandle
83  - if:
84      properties:
85        compatible:
86          contains:
87            enum:
88              - google,gs101-wdt
89              - samsung,exynos850-wdt
90              - samsung,exynosautov9-wdt
91    then:
92      properties:
93        clocks:
94          items:
95            - description: Bus clock, used for register interface
96            - description: Source clock (driving watchdog counter)
97        clock-names:
98          items:
99            - const: watchdog
100            - const: watchdog_src
101        samsung,cluster-index:
102          enum: [0, 1]
103      required:
104        - samsung,cluster-index
105    else:
106      properties:
107        clocks:
108          items:
109            - description: Bus clock, which is also a source clock
110        clock-names:
111          items:
112            - const: watchdog
113        samsung,cluster-index: false
114
115unevaluatedProperties: false
116
117examples:
118  - |
119    watchdog@101d0000 {
120        compatible = "samsung,exynos5250-wdt";
121        reg = <0x101D0000 0x100>;
122        interrupts = <0 42 0>;
123        clocks = <&clock 336>;
124        clock-names = "watchdog";
125        samsung,syscon-phandle = <&pmu_syscon>;
126    };
127