Documentation/devicetree/bindings/sound/simple-scu-card.txt

   1 ASoC Simple SCU Sound Card
   2
   3 Simple SCU Sound Card is "Simple Sound Card" + "ALSA DPCM".
   4 For example, you can use this driver if you want to exchange sampling rate convert,
   5 Mixing, etc...
   6
   7 Required properties:
   8
   9 - compatible                            : "simple-scu-audio-card"
  10                                           "renesas,rsrc-card"
  11 Optional properties:
  12
  13 - simple-audio-card,name                : see simple-audio-card.txt
  14 - simple-audio-card,cpu                 : see simple-audio-card.txt
  15 - simple-audio-card,codec               : see simple-audio-card.txt
  16
  17 Optional subnode properties:
  18
  19 - simple-audio-card,format              : see simple-audio-card.txt
  20 - simple-audio-card,frame-master        : see simple-audio-card.txt
  21 - simple-audio-card,bitclock-master     : see simple-audio-card.txt
  22 - simple-audio-card,bitclock-inversion  : see simple-audio-card.txt
  23 - simple-audio-card,frame-inversion     : see simple-audio-card.txt
  24 - simple-audio-card,convert-rate        : platform specified sampling rate convert
  25 - simple-audio-card,convert-channels    : platform specified converted channel size (2 - 8 ch)
  26 - simple-audio-card,prefix              : see routing
  27 - simple-audio-card,widgets             : Please refer to widgets.txt.
  28 - simple-audio-card,routing             : A list of the connections between audio components.
  29                                           Each entry is a pair of strings, the first being the connection's sink,
  30                                           the second being the connection's source. Valid names for sources.
  31                                           use audio-prefix if some components is using same sink/sources naming.
  32                                           it can be used if compatible was "renesas,rsrc-card";
  33
  34 Required CPU/CODEC subnodes properties:
  35
  36 - sound-dai                             : see simple-audio-card.txt
  37
  38 Optional CPU/CODEC subnodes properties:
  39
  40 - clocks / system-clock-frequency       : see simple-audio-card.txt
  41
  42 Example 1. Sampling Rate Conversion
  43
  44 sound {
  45         compatible = "simple-scu-audio-card";
  46
  47         simple-audio-card,name = "rsnd-ak4643";
  48         simple-audio-card,format = "left_j";
  49         simple-audio-card,bitclock-master = <&sndcodec>;
  50         simple-audio-card,frame-master = <&sndcodec>;
  51
  52         simple-audio-card,convert-rate = <48000>;
  53
  54         simple-audio-card,prefix = "ak4642";
  55         simple-audio-card,routing = "ak4642 Playback", "DAI0 Playback",
  56                         "DAI0 Capture", "ak4642 Capture";
  57
  58         sndcpu: simple-audio-card,cpu {
  59                 sound-dai = <&rcar_sound>;
  60         };
  61
  62         sndcodec: simple-audio-card,codec {
  63                 sound-dai = <&ak4643>;
  64                 system-clock-frequency = <11289600>;
  65         };
  66 };
  67
  68 Example 2. 2 CPU 1 Codec (Mixing)
  69
  70 sound {
  71         compatible = "simple-scu-audio-card";
  72
  73         simple-audio-card,name = "rsnd-ak4643";
  74         simple-audio-card,format = "left_j";
  75         simple-audio-card,bitclock-master = <&dpcmcpu>;
  76         simple-audio-card,frame-master = <&dpcmcpu>;
  77
  78         simple-audio-card,prefix = "ak4642";
  79         simple-audio-card,routing = "ak4642 Playback", "DAI0 Playback",
  80                         "ak4642 Playback", "DAI1 Playback";
  81
  82         dpcmcpu: cpu@0 {
  83                 sound-dai = <&rcar_sound 0>;
  84         };
  85
  86         cpu@1 {
  87                 sound-dai = <&rcar_sound 1>;
  88         };
  89
  90         codec {
  91                 sound-dai = <&ak4643>;
  92                 clocks = <&audio_clock>;
  93         };
  94 };