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
7 title: Samsung SoC Watchdog Timer Controller
8
9 maintainers:
10 - Krzysztof Kozlowski <krzk@kernel.org>
11
12 description: |+
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
17 properties:
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
60 required:
61 - compatible
62 - clocks
63 - clock-names
64 - interrupts
65 - reg
66
67 allOf:
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
115 unevaluatedProperties: false
116
117 examples:
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 };
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