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,armv7m-systick.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: ARMv7M System Timer
8
9 maintainers:
10 - Alexandre Torgue <alexandre.torgue@foss.st.com>
11 - Fabrice Gasnier <fabrice.gasnier@foss.st.com>
12
13 description: ARMv7-M includes a system timer, known as SysTick.
14
15 properties:
16 compatible:
17 const: arm,armv7m-systick
18
19 reg:
20 maxItems: 1
21
22 clocks:
23 maxItems: 1
24
25 clock-frequency: true
26
27 oneOf:
28 - required:
29 - clocks
30 - required:
31 - clock-frequency
32
33 required:
34 - compatible
35 - reg
36
37 additionalProperties: false
38
39 examples:
40 - |
41 timer@e000e010 {
42 compatible = "arm,armv7m-systick";
43 reg = <0xe000e010 0x10>;
44 clocks = <&clk_systick>;
45 };
46
47 - |
48 timer@e000e010 {
49 compatible = "arm,armv7m-systick";
50 reg = <0xe000e010 0x10>;
51 clock-frequency = <90000000>;
52 };
53
54 ...
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