1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/counter/interrupt-counter.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Interrupt counter
8
9 maintainers:
10 - Oleksij Rempel <o.rempel@pengutronix.de>
11
12 description: |
13 A generic interrupt counter to measure interrupt frequency. It was developed
14 and used for agricultural devices to measure rotation speed of wheels or
15 other tools. Since the direction of rotation is not important, only one
16 signal line is needed.
17 Interrupts or gpios are required. If both are defined, the interrupt will
18 take precedence for counting interrupts.
19
20 properties:
21 compatible:
22 const: interrupt-counter
23
24 interrupts:
25 maxItems: 1
26
27 gpios:
28 maxItems: 1
29
30 required:
31 - compatible
32
33 anyOf:
34 - required: [ interrupts-extended ]
35 - required: [ interrupts ]
36 - required: [ gpios ]
37
38 additionalProperties: false
39
40 examples:
41 - |
42
43 #include <dt-bindings/interrupt-controller/irq.h>
44 #include <dt-bindings/gpio/gpio.h>
45
46 counter-0 {
47 compatible = "interrupt-counter";
48 interrupts-extended = <&gpio 0 IRQ_TYPE_EDGE_RISING>;
49 };
50
51 counter-1 {
52 compatible = "interrupt-counter";
53 gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
54 };
55
56 counter-2 {
57 compatible = "interrupt-counter";
58 interrupts-extended = <&gpio 2 IRQ_TYPE_EDGE_RISING>;
59 gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
60 };
61
62 ...
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