0001 # SPDX-License-Identifier: GPL-2.0
0002 %YAML 1.2
0003 ---
0004 $id: http://devicetree.org/schemas/counter/interrupt-counter.yaml#
0005 $schema: http://devicetree.org/meta-schemas/core.yaml#
0006
0007 title: Interrupt counter
0008
0009 maintainers:
0010 - Oleksij Rempel <o.rempel@pengutronix.de>
0011
0012 description: |
0013 A generic interrupt counter to measure interrupt frequency. It was developed
0014 and used for agricultural devices to measure rotation speed of wheels or
0015 other tools. Since the direction of rotation is not important, only one
0016 signal line is needed.
0017 Interrupts or gpios are required. If both are defined, the interrupt will
0018 take precedence for counting interrupts.
0019
0020 properties:
0021 compatible:
0022 const: interrupt-counter
0023
0024 interrupts:
0025 maxItems: 1
0026
0027 gpios:
0028 maxItems: 1
0029
0030 required:
0031 - compatible
0032
0033 anyOf:
0034 - required: [ interrupts-extended ]
0035 - required: [ interrupts ]
0036 - required: [ gpios ]
0037
0038 additionalProperties: false
0039
0040 examples:
0041 - |
0042
0043 #include <dt-bindings/interrupt-controller/irq.h>
0044 #include <dt-bindings/gpio/gpio.h>
0045
0046 counter-0 {
0047 compatible = "interrupt-counter";
0048 interrupts-extended = <&gpio 0 IRQ_TYPE_EDGE_RISING>;
0049 };
0050
0051 counter-1 {
0052 compatible = "interrupt-counter";
0053 gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
0054 };
0055
0056 counter-2 {
0057 compatible = "interrupt-counter";
0058 interrupts-extended = <&gpio 2 IRQ_TYPE_EDGE_RISING>;
0059 gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
0060 };
0061
0062 ...
