Documentation/devicetree/bindings/sound/renesas,rsrc-card.txt

   1 Renesas Sampling Rate Convert Sound Card:
   2
   3 Renesas Sampling Rate Convert Sound Card specifies audio DAI connections of SoC <-> codec.
   4
   5 Required properties:
   6
   7 - compatible                            : "renesas,rsrc-card,<board>"
   8                                           Examples with soctypes are:
   9                                             - "renesas,rsrc-card,lager"
  10                                             - "renesas,rsrc-card,koelsch"
  11 Optional properties:
  12
  13 - card_name                             : User specified audio sound card name, one string
  14                                           property.
  15 - cpu                                   : CPU   sub-node
  16 - codec                                 : CODEC sub-node
  17
  18 Optional subnode properties:
  19
  20 - format                                : CPU/CODEC common audio format.
  21                                           "i2s", "right_j", "left_j" , "dsp_a"
  22                                           "dsp_b", "ac97", "pdm", "msb", "lsb"
  23 - frame-master                          : Indicates dai-link frame master.
  24                                           phandle to a cpu or codec subnode.
  25 - bitclock-master                       : Indicates dai-link bit clock master.
  26                                           phandle to a cpu or codec subnode.
  27 - bitclock-inversion                    : bool property. Add this if the
  28                                           dai-link uses bit clock inversion.
  29 - frame-inversion                       : bool property. Add this if the
  30                                           dai-link uses frame clock inversion.
  31 - convert-rate                          : platform specified sampling rate convert
  32
  33 Required CPU/CODEC subnodes properties:
  34
  35 - sound-dai                             : phandle and port of CPU/CODEC
  36
  37 Optional CPU/CODEC subnodes properties:
  38
  39 - clocks / system-clock-frequency       : specify subnode's clock if needed.
  40                                           it can be specified via "clocks" if system has
  41                                           clock node (= common clock), or "system-clock-frequency"
  42                                           (if system doens't support common clock)
  43                                           If a clock is specified, it is
  44                                           enabled with clk_prepare_enable()
  45                                           in dai startup() and disabled with
  46                                           clk_disable_unprepare() in dai
  47                                           shutdown().
  48
  49 Example
  50
  51 sound {
  52         compatible = "renesas,rsrc-card,lager";
  53
  54         card-name = "rsnd-ak4643";
  55         format = "left_j";
  56         bitclock-master = <&sndcodec>;
  57         frame-master = <&sndcodec>;
  58
  59         sndcpu: cpu {
  60                 sound-dai = <&rcar_sound>;
  61         };
  62
  63         sndcodec: codec {
  64                 sound-dai = <&ak4643>;
  65                 system-clock-frequency = <11289600>;
  66         };
  67 };