arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts

   1 // Overlay for i2c_gpio bitbanging host bus.
   2 /dts-v1/;
   3 /plugin/;
   4
   5 / {
   6         compatible = "brcm,bcm2708";
   7
   8         fragment@0 {
   9                 target-path = "/";
  10                 __overlay__ {
  11                         i2c_gpio: i2c@0 {
  12                                 compatible = "i2c-gpio";
  13                                 gpios = <&gpio 23 0 /* sda */
  14                                          &gpio 24 0 /* scl */
  15                                         >;
  16                                 i2c-gpio,delay-us = <2>;        /* ~100 kHz */
  17                                 #address-cells = <1>;
  18                                 #size-cells = <0>;
  19                         };
  20                 };
  21         };
  22
  23         fragment@1 {
  24                 target-path = "/aliases";
  25                 __overlay__ {
  26                         i2c_gpio = "/i2c@0";
  27                 };
  28         };
  29
  30         fragment@2 {
  31                 target-path = "/__symbols__";
  32                 __overlay__ {
  33                         i2c_gpio = "/i2c@0";
  34                 };
  35         };
  36
  37         __overrides__ {
  38                 i2c_gpio_sda = <&i2c_gpio>,"gpios:4";
  39                 i2c_gpio_scl = <&i2c_gpio>,"gpios:16";
  40                 i2c_gpio_delay_us = <&i2c_gpio>,"i2c-gpio,delay-us:0";
  41         };
  42 };
  43