Documentation/devicetree/bindings/counter/interrupt-counter.yaml

   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 ...