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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/counter/interrupt-counter.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Interrupt counter
maintainers:
- Oleksij Rempel <o.rempel@pengutronix.de>
description: |
A generic interrupt counter to measure interrupt frequency. It was developed
and used for agricultural devices to measure rotation speed of wheels or
other tools. Since the direction of rotation is not important, only one
signal line is needed.
Interrupts or gpios are required. If both are defined, the interrupt will
take precedence for counting interrupts.
properties:
compatible:
const: interrupt-counter
interrupts:
maxItems: 1
gpios:
maxItems: 1
required:
- compatible
anyOf:
- required: [ interrupts-extended ]
- required: [ interrupts ]
- required: [ gpios ]
additionalProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/gpio/gpio.h>
counter-0 {
compatible = "interrupt-counter";
interrupts-extended = <&gpio 0 IRQ_TYPE_EDGE_RISING>;
};
counter-1 {
compatible = "interrupt-counter";
gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
};
counter-2 {
compatible = "interrupt-counter";
interrupts-extended = <&gpio 2 IRQ_TYPE_EDGE_RISING>;
gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
};
...