1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/timer/arm,twd-timer.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: ARM Timer-Watchdog Timer
8
9 maintainers:
10 - Rob Herring <robh@kernel.org>
11
12 description:
13 ARM 11MP, Cortex-A5 and Cortex-A9 are often associated with a per-core
14 Timer-Watchdog (aka TWD), which provides both a per-cpu local timer
15 and watchdog.
16
17 The TWD is usually attached to a GIC to deliver its two per-processor
18 interrupts.
19
20 properties:
21 compatible:
22 enum:
23 - arm,cortex-a9-twd-timer
24 - arm,cortex-a5-twd-timer
25 - arm,arm11mp-twd-timer
26
27 reg:
28 maxItems: 1
29
30 interrupts:
31 maxItems: 1
32
33 clocks:
34 maxItems: 1
35
36 always-on:
37 description:
38 If present, the timer is powered through an always-on power domain,
39 therefore it never loses context.
40
41 required:
42 - compatible
43 - reg
44 - interrupts
45
46 additionalProperties: false
47
48 examples:
49 - |
50 #include <dt-bindings/interrupt-controller/arm-gic.h>
51
52 timer@2c000600 {
53 compatible = "arm,arm11mp-twd-timer";
54 reg = <0x2c000600 0x20>;
55 interrupts = <GIC_PPI 13 0xf01>;
56 };
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