xref: /linux/Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml (revision ff68e816856383c2a31f45a94d5b55f18e90de03) 
1# SPDX-License-Identifier: GPL-2.0-only
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/watchdog/snps,dw-wdt.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Synopsys Designware Watchdog Timer
8
9allOf:
10  - $ref: "watchdog.yaml#"
11
12maintainers:
13  - Jamie Iles <jamie@jamieiles.com>
14
15properties:
16  compatible:
17    oneOf:
18      - const: snps,dw-wdt
19      - items:
20          - enum:
21              - rockchip,px30-wdt
22              - rockchip,rk3066-wdt
23              - rockchip,rk3128-wdt
24              - rockchip,rk3188-wdt
25              - rockchip,rk3228-wdt
26              - rockchip,rk3288-wdt
27              - rockchip,rk3308-wdt
28              - rockchip,rk3328-wdt
29              - rockchip,rk3368-wdt
30              - rockchip,rk3399-wdt
31              - rockchip,rk3568-wdt
32              - rockchip,rk3588-wdt
33              - rockchip,rv1108-wdt
34          - const: snps,dw-wdt
35
36  reg:
37    maxItems: 1
38
39  interrupts:
40    description: DW Watchdog pre-timeout interrupt
41    maxItems: 1
42
43  clocks:
44    minItems: 1
45    items:
46      - description: Watchdog timer reference clock
47      - description: APB3 interface clock
48
49  clock-names:
50    minItems: 1
51    items:
52      - const: tclk
53      - const: pclk
54
55  resets:
56    description: Phandle to the DW Watchdog reset lane
57    maxItems: 1
58
59  snps,watchdog-tops:
60    $ref: /schemas/types.yaml#/definitions/uint32-array
61    description: |
62      DW APB Watchdog custom timer intervals - Timeout Period ranges (TOPs).
63      Each TOP is a number loaded into the watchdog counter at the moment of
64      the timer restart. The counter decrementing happens each tick of the
65      reference clock. Therefore the TOPs array is equivalent to an array of
66      the timer expiration intervals supported by the DW APB Watchdog. Note
67      DW APB Watchdog IP-core might be synthesized with fixed TOP values,
68      in which case this property is unnecessary with default TOPs utilized.
69    default: [0x0001000 0x0002000 0x0004000 0x0008000
70      0x0010000 0x0020000 0x0040000 0x0080000
71      0x0100000 0x0200000 0x0400000 0x0800000
72      0x1000000 0x2000000 0x4000000 0x8000000]
73    minItems: 16
74    maxItems: 16
75
76unevaluatedProperties: false
77
78required:
79  - compatible
80  - reg
81  - clocks
82
83examples:
84  - |
85    watchdog@ffd02000 {
86      compatible = "snps,dw-wdt";
87      reg = <0xffd02000 0x1000>;
88      interrupts = <0 171 4>;
89      clocks = <&per_base_clk>;
90      resets = <&wdt_rst>;
91    };
92
93  - |
94    watchdog@ffd02000 {
95      compatible = "snps,dw-wdt";
96      reg = <0xffd02000 0x1000>;
97      interrupts = <0 171 4>;
98      clocks = <&per_base_clk>;
99      clock-names = "tclk";
100      snps,watchdog-tops = <0x000000FF 0x000001FF 0x000003FF
101                            0x000007FF 0x0000FFFF 0x0001FFFF
102                            0x0003FFFF 0x0007FFFF 0x000FFFFF
103                            0x001FFFFF 0x003FFFFF 0x007FFFFF
104                            0x00FFFFFF 0x01FFFFFF 0x03FFFFFF
105                            0x07FFFFFF>;
106    };
107...
108