LibreELEC.tv/projects/Slice/config/slice-overlay.dts

// Definitions for Slice hardware
/dts-v1/;
/plugin/;

#include "dt-bindings/clock/bcm2835.h"

/ {
  compatible = "brcm,bcm2708";

  //
  // Set up GPIOs:
  //  I2C1 on GPIO44,45
  //  LIRC input/output on GPIO4 and 37 (NB GPIO4 NC on Slice)
  //  I2S on GPIO28-31
  //
  fragment@0 {
    target = <&gpio>;
    __overlay__ {
      i2c1_pins: i2c1 {
        brcm,pins = <44 45>;
        brcm,function = <6>; /* alt2 */
      };
      lirc_pins: lirc_pins {
        brcm,pins = <4 37>; // <out in>
        brcm,function = <1 0>; // out in
        brcm,pull = <0 1>; // off down
      };
      i2s_pins: i2s {
        brcm,pins = <28 29 30 31>;
        brcm,function = <6>; /* alt2 */
      };
      ws2812_pins: ws2812 {
        brcm,pins = <40>;
        brcm,function = <4>; /* alt0 */
      };
    };
  };

  //
  // I2C at 100KHz
  //
  fragment@1 {
    target = <&i2c1>;
    __overlay__ {
      pinctrl-names = "default";
      pinctrl-0 = <&i2c1_pins>;
      clock-frequency = <100000>;
    };
  };

  //
  // Add devices to I2C1 Bus:
  //  PCF8523 RTC device
  //  CS4265 Audio CODEC
  //
  fragment@2 {
    target = <&i2c1>;
    __overlay__ {
      #address-cells = <1>;
      #size-cells = <0>;
      status = "okay";
      pcf8523@68 {
        compatible = "nxp,pcf8523";
        reg = <0x68>;
        nxp,xtalcap-7pf; /* set crystal load to 7pf */
        status = "okay";
      };
      cs4265@4e {
        #sound-dai-cells = <0>;
        compatible = "cirrus,cs4265";
        reg = <0x4e>;
        cs4265-reset-gpios = <&gpio 33 0>; /* AUD_RST_N on GPIO33 */
        cirrus,no-s16le; /* remove S16LE support to workaround I2S controller issue */
        status = "okay";
      };
    };
  };

  //
  // LIRC
  //
  fragment@3 {
    target-path = "/";
    __overlay__ {
      lirc_rpi: lirc_rpi {
        compatible = "rpi,lirc-rpi";
        pinctrl-names = "default";
        pinctrl-0 = <&lirc_pins>;
        status = "okay";

        // Override autodetection of IR receiver circuit
        // (0 = active high, 1 = active low, -1 = no override )
        rpi,sense = <0xffffffff>;

        // Software carrier
        // (0 = off, 1 = on)
        rpi,softcarrier = <1>;

        // Invert output
        // (0 = off, 1 = on)
        rpi,invert = <0>;

        // Enable debugging messages
        // (0 = off, 1 = on)
        rpi,debug = <0>;
      };
    };
  };

  //
  // Audio driver
  //
  fragment@4 {
    #address-cells = <1>;
    #size-cells = <1>;
    target = <&sound>;
    __overlay__ {
      compatible = "fiveninjas,slice";
      clocks = <&cprman BCM2835_CLOCK_GP0>;
      clock-names = "gp0";
      pinctrl-names = "default";
      i2s-controller = <&i2s>;
      status = "okay";
    };
  };

  //
  // Enable I2S
  //
  fragment@5 {
    target = <&i2s>;
    __overlay__ {
      pinctrl-names = "default";
      pinctrl-0 = <&i2s_pins>;
      brcm,enable-mmap;
      status = "okay";
    };
  };

  //
  // WS2812B LEDs driver
  //
  fragment@6 {
    target = <&soc>;
    __overlay__ {
      #address-cells = <1>;
      #size-cells = <1>;
      ws2812: ws2812 {
        compatible = "rpi,ws2812";
        pinctrl-names = "default";
        pinctrl-0 = <&ws2812_pins>;
        reg = <0x7e20c000 0x100>; /* PWM */
        dmas = <&dma 5>;
        dma-names = "pwm_dma";
        led-en-gpios = <&gpio 43 0>;
        rpi,invert = <1>;
        rpi,num_leds = <25>;
        status = "okay";
      };
    };
  };

  //
  // Disable standard audio
  //
  fragment@7 {
    target = <&audio>;
    __overlay__ {
      status = "disabled";
    };
  };
};