arch/arm/boot/dts/overlays/mcp23017-overlay.dts

   1 // Definitions for MCP23017 Gpio Extender from Microchip Semiconductor
   2
   3 /dts-v1/;
   4 /plugin/;
   5
   6 / {
   7         compatible = "brcm,bcm2835";
   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 {
  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: mcp@20 {
  33                                 compatible = "microchip,mcp23017";
  34                                 reg = <0x20>;
  35                                 gpio-controller;
  36                                 #gpio-cells = <2>;
  37
  38                                 status = "okay";
  39                         };
  40                 };
  41         };
  42
  43         fragment@3 {
  44                 target = <&mcp23017>;
  45                 __dormant__ {
  46                         compatible = "microchip,mcp23008";
  47                 };
  48         };
  49
  50         fragment@4 {
  51                 target = <&mcp23017>;
  52                 mcp23017_irq: __overlay__ {
  53                         #interrupt-cells=<2>;
  54                         interrupt-parent = <&gpio>;
  55                         interrupts = <4 2>;
  56                         interrupt-controller;
  57                         microchip,irq-mirror;
  58                 };
  59         };
  60
  61         __overrides__ {
  62                 gpiopin = <&mcp23017_pins>,"brcm,pins:0",
  63                                 <&mcp23017_irq>,"interrupts:0";
  64                 addr = <&mcp23017>,"reg:0", <&mcp23017_pins>,"reg:0";
  65                 mcp23008 = <0>,"=3";
  66                 noints = <0>,"!1!4";
  67         };
  68 };
  69