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 enum:
20 - samsung,s3c2410-wdt # for S3C2410
21 - samsung,s3c6410-wdt # for S3C6410, S5PV210 and Exynos4
22 - samsung,exynos5250-wdt # for Exynos5250
23 - samsung,exynos5420-wdt # for Exynos5420
24 - samsung,exynos7-wdt # for Exynos7
25 - samsung,exynos850-wdt # for Exynos850
26
27 reg:
28 maxItems: 1
29
30 clocks:
31 minItems: 1
32 maxItems: 2
33
34 clock-names:
35 minItems: 1
36 maxItems: 2
37
38 interrupts:
39 maxItems: 1
40
41 samsung,cluster-index:
42 $ref: /schemas/types.yaml#/definitions/uint32
43 description:
44 Index of CPU cluster on which watchdog is running (in case of Exynos850)
45
46 samsung,syscon-phandle:
47 $ref: /schemas/types.yaml#/definitions/phandle
48 description:
49 Phandle to the PMU system controller node (in case of Exynos5250,
50 Exynos5420, Exynos7 and Exynos850).
51
52 required:
53 - compatible
54 - clocks
55 - clock-names
56 - interrupts
57 - reg
58
59 allOf:
60 - $ref: watchdog.yaml#
61 - if:
62 properties:
63 compatible:
64 contains:
65 enum:
66 - samsung,exynos5250-wdt
67 - samsung,exynos5420-wdt
68 - samsung,exynos7-wdt
69 - samsung,exynos850-wdt
70 then:
71 required:
72 - samsung,syscon-phandle
73 - if:
74 properties:
75 compatible:
76 contains:
77 enum:
78 - samsung,exynos850-wdt
79 then:
80 properties:
81 clocks:
82 items:
83 - description: Bus clock, used for register interface
84 - description: Source clock (driving watchdog counter)
85 clock-names:
86 items:
87 - const: watchdog
88 - const: watchdog_src
89 samsung,cluster-index:
90 enum: [0, 1]
91 required:
92 - samsung,cluster-index
93 else:
94 properties:
95 clocks:
96 items:
97 - description: Bus clock, which is also a source clock
98 clock-names:
99 items:
100 - const: watchdog
101 samsung,cluster-index: false
102
103 unevaluatedProperties: false
104
105 examples:
106 - |
107 watchdog@101d0000 {
108 compatible = "samsung,exynos5250-wdt";
109 reg = <0x101D0000 0x100>;
110 interrupts = <0 42 0>;
111 clocks = <&clock 336>;
112 clock-names = "watchdog";
113 samsung,syscon-phandle = <&pmu_syscon>;
114 };
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