| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | ... |