arch/arm/boot/dts/overlays/allo-piano-dac-pcm512x-audio-overlay.dts

   1 /*
   2  * Definitions for Allo Piano DAC (2.0/2.1) boards
   3  *
   4  * NB. The Piano DAC 2.1 board contains 2x TI PCM5142 DAC's. One DAC is stereo
   5  * (left/right) and the other provides a subwoofer output, using DSP on the
   6  * chip for digital high/low pass crossover.
   7  * The initial support for this hardware, that doesn't require any codec driver
   8  * modifications, uses only one DAC chip for stereo (left/right) output, the
   9  * chip with 0x4c slave address. The other chip at 0x4d is currently ignored!
  10  */
  11
  12 /dts-v1/;
  13 /plugin/;
  14
  15 / {
  16         compatible = "brcm,bcm2708";
  17
  18         fragment@0 {
  19                 target = <&i2s>;
  20                 __overlay__ {
  21                         status = "okay";
  22                 };
  23         };
  24
  25         fragment@1 {
  26                 target = <&i2c1>;
  27                 __overlay__ {
  28                         #address-cells = <1>;
  29                         #size-cells = <0>;
  30                         status = "okay";
  31
  32                         pcm5142@4c {
  33                                 #sound-dai-cells = <0>;
  34                                 compatible = "ti,pcm5142";
  35                                 reg = <0x4c>;
  36                                 status = "okay";
  37                         };
  38                 };
  39         };
  40
  41         fragment@2 {
  42                 target = <&sound>;
  43                 piano_dac: __overlay__ {
  44                         compatible = "allo,piano-dac";
  45                         i2s-controller = <&i2s>;
  46                         status = "okay";
  47                 };
  48         };
  49
  50         __overrides__ {
  51                 24db_digital_gain =
  52                         <&piano_dac>,"allo,24db_digital_gain?";
  53         };
  54 };