raspi/customs/boot/overlays/mcp23017.dts

   1 // Definitions for MCP23017 Gpio Extender from Microchip Semiconductor
   2
   3 /dts-v1/;
   4 /plugin/;
   5
   6 / {
   7         compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
   8
   9         fragment@0 {
  10                 target = <&i2c1>;
  11                 __overlay__ {
  12                         status = "okay";
  13                 };
  14         };
  15
  16         fragment@1 {
  17                 target = <&gpio>;
  18                 __overlay__ {
  19                         mcp23017_pins: mcp23017_pins {
  20                                 brcm,pins = <4>;
  21                                 brcm,function = <0>;
  22                         };
  23                 };
  24         };
  25
  26         fragment@2 {
  27                 target = <&i2c1>;
  28                 __overlay__ {
  29                         #address-cells = <1>;
  30                         #size-cells = <0>;
  31
  32                         mcp23017@20 {
  33                                 compatible = "microchip,mcp23017";
  34                                 reg = <0x20>;
  35                                 gpio-controller;
  36                                 #gpio-cells = <2>;
  37
  38                                 interrupt-parent = <&gpio>;
  39                                 interrupts = <4 2>;
  40                                 interrupt-controller;
  41                                 #interrupt-cells=<2>;
  42                                 microchip,irq-mirror;
  43
  44                                 status = "okay";
  45                         };
  46                 };
  47         };
  48 };
  49