Documentation/devicetree/bindings/pps/pps-gpio.yaml

   1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/pps/pps-gpio.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: PPS Signal via GPIO
   8
   9 maintainers:
  10   - Fabio Estevam <festevam@gmail.com>
  11
  12 properties:
  13   compatible:
  14     const: pps-gpio
  15
  16   gpios:
  17     description: The GPIO that provides the PPS signal.
  18     maxItems: 1
  19
  20   echo-gpios:
  21     description: The GPIO that provides the PPS ECHO signal.
  22     maxItems: 1
  23
  24   echo-active-ms:
  25     description: Duration in ms of the active portion of the echo pulse.
  26
  27   assert-falling-edge:
  28     description: Indicates a falling edge assert, when present. Rising edge if absent.
  29     type: boolean
  30
  31 required:
  32   - compatible
  33   - gpios
  34
  35 additionalProperties: false
  36
  37 examples:
  38   - |
  39       #include <dt-bindings/gpio/gpio.h>
  40
  41       pps {
  42           compatible = "pps-gpio";
  43           pinctrl-names = "default";
  44           pinctrl-0 = <&pinctrl_pps>;
  45           gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;
  46           assert-falling-edge;
  47           echo-gpios = <&gpio1 27 GPIO_ACTIVE_HIGH>;
  48           echo-active-ms = <100>;
  49       };