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

   1 // Device tree overlay for I2C connected Goodix gt9271 multiple touch controller
   2 /dts-v1/;
   3 /plugin/;
   4
   5 / {
   6         compatible = "brcm,bcm2835";
   7
   8         fragment@0 {
   9                 target = <&gpio>;
  10                 __overlay__ {
  11                         goodix_pins: goodix_pins {
  12                                 brcm,pins = <4 17>; // interrupt and reset
  13                                 brcm,function = <0 0>; // in
  14                                 brcm,pull = <2 2>; // pull-up
  15                         };
  16                 };
  17         };
  18
  19         fragment@1 {
  20                 target = <&i2c1>;
  21                 __overlay__ {
  22                         #address-cells = <1>;
  23                         #size-cells = <0>;
  24                         status = "okay";
  25
  26                         gt9271: gt9271@14 {
  27                                 compatible = "goodix,gt9271";
  28                                 reg = <0x14>;
  29                                 pinctrl-names = "default";
  30                                 pinctrl-0 = <&goodix_pins>;
  31                                 interrupt-parent = <&gpio>;
  32                                 interrupts = <4 2>; // high-to-low edge triggered
  33                                 irq-gpios = <&gpio 4 0>; // Pin7 on GPIO header
  34                                 reset-gpios = <&gpio 17 0>; // Pin11 on GPIO header
  35                         };
  36                 };
  37         };
  38
  39         __overrides__ {
  40                 interrupt = <&goodix_pins>,"brcm,pins:0",
  41                         <&gt9271>,"interrupts:0",
  42                         <&gt9271>,"irq-gpios:4";
  43                 reset = <&goodix_pins>,"brcm,pins:4",
  44                         <&gt9271>,"reset-gpios:4";
  45         };
  46 };