arch/arm/boot/dts/overlays/max98357a-overlay.dts

   1 // Overlay for Maxim MAX98357A audio DAC
   2
   3 // dtparams:
   4 //     no-sdmode  - SD_MODE pin not managed by driver.
   5 //     sdmode-pin - Specify GPIO pin to which SD_MODE is connected (default 4).
   6
   7 /dts-v1/;
   8 /plugin/;
   9
  10 / {
  11         compatible = "brcm,bcm2835";
  12
  13         /* Enable I2S */
  14         fragment@0 {
  15                 target = <&i2s>;
  16                 __overlay__ {
  17                         status = "okay";
  18                 };
  19         };
  20
  21         /* DAC whose SD_MODE pin is managed by driver (via GPIO pin) */
  22         fragment@1 {
  23                 target-path = "/";
  24                 __overlay__ {
  25                         max98357a_dac: max98357a {
  26                                 compatible = "maxim,max98357a";
  27                                 #sound-dai-cells = <0>;
  28                                 sdmode-gpios = <&gpio 4 0>;   /* 2nd word overwritten by sdmode-pin parameter */
  29                                 status = "okay";
  30                         };
  31                 };
  32         };
  33
  34         /* DAC whose SD_MODE pin is not managed by driver */
  35         fragment@2 {
  36                 target-path = "/";
  37                 __dormant__ {
  38                         max98357a_nsd: max98357a {
  39                                 compatible = "maxim,max98357a";
  40                                 #sound-dai-cells = <0>;
  41                                 status = "okay";
  42                         };
  43                 };
  44         };
  45
  46         /* Soundcard connecting I2S to DAC with SD_MODE */
  47         fragment@3 {
  48                 target = <&sound>;
  49                 __overlay__ {
  50                         compatible = "simple-audio-card";
  51                         simple-audio-card,format = "i2s";
  52                         simple-audio-card,name = "MAX98357A";
  53                         status = "okay";
  54                         simple-audio-card,cpu {
  55                                 sound-dai = <&i2s>;
  56                         };
  57                         simple-audio-card,codec {
  58                                 sound-dai = <&max98357a_dac>;
  59                         };
  60                 };
  61         };
  62
  63         /* Soundcard connecting I2S to DAC without SD_MODE */
  64         fragment@4 {
  65                 target = <&sound>;
  66                 __dormant__ {
  67                         compatible = "simple-audio-card";
  68                         simple-audio-card,format = "i2s";
  69                         simple-audio-card,name = "MAX98357A";
  70                         status = "okay";
  71                         simple-audio-card,cpu {
  72                                 sound-dai = <&i2s>;
  73                         };
  74                         simple-audio-card,codec {
  75                                 sound-dai = <&max98357a_nsd>;
  76                         };
  77                 };
  78         };
  79
  80         __overrides__ {
  81                 no-sdmode  = <0>,"-1+2-3+4";
  82                 sdmode-pin = <&max98357a_dac>,"sdmode-gpios:4";
  83         };
  84 };