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 7title: Interrupt counter 8 9maintainers: 10 - Oleksij Rempel <o.rempel@pengutronix.de> 11 12description: | 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 20properties: 21 compatible: 22 const: interrupt-counter 23 24 interrupts: 25 maxItems: 1 26 27 gpios: 28 maxItems: 1 29 30required: 31 - compatible 32 33anyOf: 34 - required: [ interrupts-extended ] 35 - required: [ interrupts ] 36 - required: [ gpios ] 37 38additionalProperties: false 39 40examples: 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... 63