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,routing             : A list of the connections between audio components.
  28                                           Each entry is a pair of strings, the first being the connection's sink,
  29                                           the second being the connection's source. Valid names for sources.
  30                                           use audio-prefix if some components is using same sink/sources naming.
  31                                           it can be used if compatible was "renesas,rsrc-card";
  32
  33 Required CPU/CODEC subnodes properties:
  34
  35 - sound-dai                             : see simple-audio-card.txt
  36
  37 Optional CPU/CODEC subnodes properties:
  38
  39 - clocks / system-clock-frequency       : see simple-audio-card.txt
  40
  41 Example 1. Sampling Rate Conversion
  42
  43 sound {
  44         compatible = "simple-scu-audio-card";
  45
  46         simple-audio-card,name = "rsnd-ak4643";
  47         simple-audio-card,format = "left_j";
  48         simple-audio-card,bitclock-master = <&sndcodec>;
  49         simple-audio-card,frame-master = <&sndcodec>;
  50
  51         simple-audio-card,convert-rate = <48000>;
  52
  53         simple-audio-card,prefix = "ak4642";
  54         simple-audio-card,routing = "ak4642 Playback", "DAI0 Playback",
  55                         "DAI0 Capture", "ak4642 Capture";
  56
  57         sndcpu: simple-audio-card,cpu {
  58                 sound-dai = <&rcar_sound>;
  59         };
  60
  61         sndcodec: simple-audio-card,codec {
  62                 sound-dai = <&ak4643>;
  63                 system-clock-frequency = <11289600>;
  64         };
  65 };
  66
  67 Example 2. 2 CPU 1 Codec (Mixing)
  68
  69 sound {
  70         compatible = "simple-scu-audio-card";
  71
  72         simple-audio-card,name = "rsnd-ak4643";
  73         simple-audio-card,format = "left_j";
  74         simple-audio-card,bitclock-master = <&dpcmcpu>;
  75         simple-audio-card,frame-master = <&dpcmcpu>;
  76
  77         simple-audio-card,prefix = "ak4642";
  78         simple-audio-card,routing = "ak4642 Playback", "DAI0 Playback",
  79                         "ak4642 Playback", "DAI1 Playback";
  80
  81         dpcmcpu: cpu@0 {
  82                 sound-dai = <&rcar_sound 0>;
  83         };
  84
  85         cpu@1 {
  86                 sound-dai = <&rcar_sound 1>;
  87         };
  88
  89         codec {
  90                 sound-dai = <&ak4643>;
  91                 clocks = <&audio_clock>;
  92         };
  93 };