xref: /freebsd/sys/contrib/device-tree/Bindings/watchdog/snps,dw-wdt.yaml (revision af23369a6deaaeb612ab266eb88b8bb8d560c322) 
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,rk3188-wdt
24              - rockchip,rk3228-wdt
25              - rockchip,rk3288-wdt
26              - rockchip,rk3308-wdt
27              - rockchip,rk3328-wdt
28              - rockchip,rk3368-wdt
29              - rockchip,rk3399-wdt
30              - rockchip,rk3568-wdt
31              - rockchip,rv1108-wdt
32          - const: snps,dw-wdt
33
34  reg:
35    maxItems: 1
36
37  interrupts:
38    description: DW Watchdog pre-timeout interrupt
39    maxItems: 1
40
41  clocks:
42    minItems: 1
43    items:
44      - description: Watchdog timer reference clock
45      - description: APB3 interface clock
46
47  clock-names:
48    minItems: 1
49    items:
50      - const: tclk
51      - const: pclk
52
53  resets:
54    description: Phandle to the DW Watchdog reset lane
55    maxItems: 1
56
57  snps,watchdog-tops:
58    $ref: /schemas/types.yaml#/definitions/uint32-array
59    description: |
60      DW APB Watchdog custom timer intervals - Timeout Period ranges (TOPs).
61      Each TOP is a number loaded into the watchdog counter at the moment of
62      the timer restart. The counter decrementing happens each tick of the
63      reference clock. Therefore the TOPs array is equivalent to an array of
64      the timer expiration intervals supported by the DW APB Watchdog. Note
65      DW APB Watchdog IP-core might be synthesized with fixed TOP values,
66      in which case this property is unnecessary with default TOPs utilized.
67    default: [0x0001000 0x0002000 0x0004000 0x0008000
68      0x0010000 0x0020000 0x0040000 0x0080000
69      0x0100000 0x0200000 0x0400000 0x0800000
70      0x1000000 0x2000000 0x4000000 0x8000000]
71    minItems: 16
72    maxItems: 16
73
74unevaluatedProperties: false
75
76required:
77  - compatible
78  - reg
79  - clocks
80
81examples:
82  - |
83    watchdog@ffd02000 {
84      compatible = "snps,dw-wdt";
85      reg = <0xffd02000 0x1000>;
86      interrupts = <0 171 4>;
87      clocks = <&per_base_clk>;
88      resets = <&wdt_rst>;
89    };
90
91  - |
92    watchdog@ffd02000 {
93      compatible = "snps,dw-wdt";
94      reg = <0xffd02000 0x1000>;
95      interrupts = <0 171 4>;
96      clocks = <&per_base_clk>;
97      clock-names = "tclk";
98      snps,watchdog-tops = <0x000000FF 0x000001FF 0x000003FF
99                            0x000007FF 0x0000FFFF 0x0001FFFF
100                            0x0003FFFF 0x0007FFFF 0x000FFFFF
101                            0x001FFFFF 0x003FFFFF 0x007FFFFF
102                            0x00FFFFFF 0x01FFFFFF 0x03FFFFFF
103                            0x07FFFFFF>;
104    };
105...
106