arch/arm/boot/dts/overlays/pps-gpio-overlay.dts

   1 /dts-v1/;
   2 /plugin/;
   3
   4 / {
   5         compatible = "brcm,bcm2835";
   6         fragment@0 {
   7                 target-path = "/";
   8                 __overlay__ {
   9                         pps: pps@12 {
  10                                 compatible = "pps-gpio";
  11                                 pinctrl-names = "default";
  12                                 pinctrl-0 = <&pps_pins>;
  13                                 gpios = <&gpio 18 0>;
  14                                 status = "okay";
  15                         };
  16                 };
  17         };
  18
  19         fragment@1 {
  20                 target = <&gpio>;
  21                 __overlay__ {
  22                         pps_pins: pps_pins@12 {
  23                                 brcm,pins =     <18>;
  24                                 brcm,function = <0>;    // in
  25                                 brcm,pull =     <0>;    // off
  26                         };
  27                 };
  28         };
  29
  30         __overrides__ {
  31                 gpiopin = <&pps>,"gpios:4",
  32                           <&pps>,"reg:0",
  33                           <&pps_pins>,"brcm,pins:0",
  34                           <&pps_pins>,"reg:0";
  35                 assert_falling_edge = <&pps>,"assert-falling-edge?";
  36                 capture_clear = <&pps>,"capture-clear?";
  37         };
  38 };