arch/arm/boot/dts/overlays/fsm-demo-overlay.dts

   1 // Demo overlay for the gpio-fsm driver
   2 /dts-v1/;
   3 /plugin/;
   4
   5 #include <dt-bindings/gpio/gpio-fsm.h>
   6
   7 #define BUTTON1 GF_IP(0)
   8 #define BUTTON2 GF_SW(0)
   9 #define RED   GF_OP(0) // GPIO7
  10 #define AMBER GF_OP(1) // GPIO8
  11 #define GREEN GF_OP(2) // GPIO25
  12
  13 /{
  14         compatible = "brcm,bcm2835";
  15
  16         fragment@0 {
  17                 target-path = "/";
  18                 __overlay__ {
  19                         fsm_demo: fsm-demo {
  20                                 compatible = "rpi,gpio-fsm";
  21
  22                                 debug = <0>;
  23                                 gpio-controller;
  24                                 #gpio-cells = <2>;
  25                                 num-swgpios = <1>;
  26                                 gpio-line-names = "button2";
  27                                 input-gpios  = <&gpio 6 1>;  // BUTTON1 (active-low)
  28                                 output-gpios = <&gpio 7 0>,  // RED
  29                                                <&gpio 8 0>,  // AMBER
  30                                                <&gpio 25 0>; // GREEN
  31                                 shutdown-timeout-ms = <2000>;
  32
  33                                 start {
  34                                         start_state;
  35                                         set = <RED 1>, <AMBER 0>, <GREEN 0>;
  36                                         start2 = <GF_DELAY 250>;
  37                                 };
  38
  39                                 start2 {
  40                                         set = <RED 0>, <AMBER 1>;
  41                                         go = <GF_DELAY 250>;
  42                                 };
  43
  44                                 go {
  45                                         set = <RED 0>, <AMBER 0>, <GREEN 1>;
  46                                         ready_wait = <BUTTON1 0>;
  47                                         shutdown1 = <GF_SHUTDOWN 0>;
  48                                 };
  49
  50                                 ready_wait {
  51                                         // Clear the soft GPIO
  52                                         set = <BUTTON2 0>;
  53                                         ready = <GF_DELAY 1000>;
  54                                         shutdown1 = <GF_SHUTDOWN 0>;
  55                                 };
  56
  57                                 ready {
  58                                         stopping = <BUTTON1 1>, <BUTTON2 1>;
  59                                         shutdown1 = <GF_SHUTDOWN 0>;
  60                                 };
  61
  62                                 stopping {
  63                                         set = <GREEN 0>, <AMBER 1>;
  64                                         stopped = <GF_DELAY 1000>;
  65                                 };
  66
  67                                 stopped {
  68                                         set = <AMBER 0>, <RED 1>;
  69                                         get_set = <GF_DELAY 3000>;
  70                                         shutdown1 = <GF_SHUTDOWN 0>;
  71                                 };
  72
  73                                 get_set {
  74                                         set = <AMBER 1>;
  75                                         go = <GF_DELAY 1000>;
  76                                 };
  77
  78                                 shutdown1 {
  79                                         set = <RED 0>, <AMBER 0>, <GREEN 1>;
  80                                         shutdown2 = <GF_SHUTDOWN 250>;
  81                                 };
  82
  83                                 shutdown2 {
  84                                         set = <AMBER 1>, <GREEN 0>;
  85                                         shutdown3 = <GF_SHUTDOWN 250>;
  86                                 };
  87
  88                                 shutdown3 {
  89                                         set = <RED 1>, <AMBER 0>;
  90                                         shutdown4 = <GF_SHUTDOWN 250>;
  91                                 };
  92
  93                                 shutdown4 {
  94                                         shutdown_state;
  95                                         set = <RED 0>, <AMBER 0>, <GREEN 0>;
  96                                 };
  97                         };
  98                };
  99         };
 100
 101         __overrides__ {
 102                 fsm_debug = <&fsm_demo>,"debug:0";
 103         };
 104 };