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 7title: PPS Signal via GPIO 8 9maintainers: 10 - Fabio Estevam <festevam@gmail.com> 11 12properties: 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 31required: 32 - compatible 33 - gpios 34 35additionalProperties: false 36 37examples: 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 }; 50