xref: /freebsd/sys/contrib/device-tree/Bindings/watchdog/snps,dw-wdt.yaml (revision 3e8eb5c7f4909209c042403ddee340b2ee7003a5) 
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,rv1108-wdt
31          - const: snps,dw-wdt
32
33  reg:
34    maxItems: 1
35
36  interrupts:
37    description: DW Watchdog pre-timeout interrupt
38    maxItems: 1
39
40  clocks:
41    minItems: 1
42    items:
43      - description: Watchdog timer reference clock
44      - description: APB3 interface clock
45
46  clock-names:
47    minItems: 1
48    items:
49      - const: tclk
50      - const: pclk
51
52  resets:
53    description: Phandle to the DW Watchdog reset lane
54    maxItems: 1
55
56  snps,watchdog-tops:
57    $ref: /schemas/types.yaml#/definitions/uint32-array
58    description: |
59      DW APB Watchdog custom timer intervals - Timeout Period ranges (TOPs).
60      Each TOP is a number loaded into the watchdog counter at the moment of
61      the timer restart. The counter decrementing happens each tick of the
62      reference clock. Therefore the TOPs array is equivalent to an array of
63      the timer expiration intervals supported by the DW APB Watchdog. Note
64      DW APB Watchdog IP-core might be synthesized with fixed TOP values,
65      in which case this property is unnecessary with default TOPs utilized.
66    default: [0x0001000 0x0002000 0x0004000 0x0008000
67      0x0010000 0x0020000 0x0040000 0x0080000
68      0x0100000 0x0200000 0x0400000 0x0800000
69      0x1000000 0x2000000 0x4000000 0x8000000]
70    minItems: 16
71    maxItems: 16
72
73unevaluatedProperties: false
74
75required:
76  - compatible
77  - reg
78  - clocks
79
80examples:
81  - |
82    watchdog@ffd02000 {
83      compatible = "snps,dw-wdt";
84      reg = <0xffd02000 0x1000>;
85      interrupts = <0 171 4>;
86      clocks = <&per_base_clk>;
87      resets = <&wdt_rst>;
88    };
89
90  - |
91    watchdog@ffd02000 {
92      compatible = "snps,dw-wdt";
93      reg = <0xffd02000 0x1000>;
94      interrupts = <0 171 4>;
95      clocks = <&per_base_clk>;
96      clock-names = "tclk";
97      snps,watchdog-tops = <0x000000FF 0x000001FF 0x000003FF
98                            0x000007FF 0x0000FFFF 0x0001FFFF
99                            0x0003FFFF 0x0007FFFF 0x000FFFFF
100                            0x001FFFFF 0x003FFFFF 0x007FFFFF
101                            0x00FFFFFF 0x01FFFFFF 0x03FFFFFF
102                            0x07FFFFFF>;
103    };
104...
105