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

   1 Simple-Card:
   2
   3 Simple-Card specifies audio DAI connection of SoC <-> codec.
   4
   5 Required properties:
   6
   7 - compatible                            : "simple-audio-card"
   8
   9 Optional properties:
  10
  11 - simple-audio-card,format              : CPU/CODEC common audio format.
  12                                           "i2s", "right_j", "left_j" , "dsp_a"
  13                                           "dsp_b", "ac97", "pdm", "msb", "lsb"
  14 - simple-audio-card,routing             : A list of the connections between audio components.
  15                                           Each entry is a pair of strings, the first being the
  16                                           connection's sink, the second being the connection's
  17                                           source.
  18
  19 Required subnodes:
  20
  21 - simple-audio-card,cpu                 : CPU   sub-node
  22 - simple-audio-card,codec               : CODEC sub-node
  23
  24 Required CPU/CODEC subnodes properties:
  25
  26 - sound-dai                             : phandle and port of CPU/CODEC
  27
  28 Optional CPU/CODEC subnodes properties:
  29
  30 - format                                : CPU/CODEC specific audio format if needed.
  31                                           see simple-audio-card,format
  32 - frame-master                          : bool property. add this if subnode is frame master
  33 - bitclock-master                       : bool property. add this if subnode is bitclock master
  34 - bitclock-inversion                    : bool property. add this if subnode has clock inversion
  35 - frame-inversion                       : bool property. add this if subnode has frame inversion
  36 - clocks / system-clock-frequency       : specify subnode's clock if needed.
  37                                           it can be specified via "clocks" if system has
  38                                           clock node (= common clock), or "system-clock-frequency"
  39                                           (if system doens't support common clock)
  40
  41 Example:
  42
  43 sound {
  44         compatible = "simple-audio-card";
  45         simple-audio-card,format = "left_j";
  46         simple-audio-card,routing =
  47                 "MIC_IN", "Mic Jack",
  48                 "Headphone Jack", "HP_OUT",
  49                 "Ext Spk", "LINE_OUT";
  50
  51         simple-audio-card,cpu {
  52                 sound-dai = <&sh_fsi2 0>;
  53         };
  54
  55         simple-audio-card,codec {
  56                 sound-dai = <&ak4648>;
  57                 bitclock-master;
  58                 frame-master;
  59                 clocks = <&osc>;
  60         };
  61 };
  62
  63 &i2c0 {
  64         ak4648: ak4648@12 {
  65                 #sound-dai-cells = <0>;
  66                 compatible = "asahi-kasei,ak4648";
  67                 reg = <0x12>;
  68         };
  69 };
  70
  71 sh_fsi2: sh_fsi2@ec230000 {
  72         #sound-dai-cells = <1>;
  73         compatible = "renesas,sh_fsi2";
  74         reg = <0xec230000 0x400>;
  75         interrupt-parent = <&gic>;
  76         interrupts = <0 146 0x4>;
  77 };