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

   1 Simple-Card:
   2
   3 Simple-Card specifies audio DAI connections of SoC <-> codec.
   4
   5 Required properties:
   6
   7 - compatible                            : "simple-audio-card"
   8
   9 Optional properties:
  10
  11 - simple-audio-card,name                : User specified audio sound card name, one string
  12                                           property.
  13 - simple-audio-card,widgets             : Please refer to widgets.txt.
  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 - simple-audio-card,mclk-fs             : Multiplication factor between stream rate and codec
  19                                           mclk. When defined, mclk-fs property defined in
  20                                           dai-link sub nodes are ignored.
  21 - simple-audio-card,hp-det-gpio         : Reference to GPIO that signals when
  22                                           headphones are attached.
  23 - simple-audio-card,mic-det-gpio        : Reference to GPIO that signals when
  24                                           a microphone is attached.
  25
  26 Optional subnodes:
  27
  28 - simple-audio-card,dai-link            : Container for dai-link level
  29                                           properties and the CPU and CODEC
  30                                           sub-nodes. This container may be
  31                                           omitted when the card has only one
  32                                           DAI link. See the examples and the
  33                                           section below.
  34
  35 Dai-link subnode properties and subnodes:
  36
  37 If dai-link subnode is omitted and the subnode properties are directly
  38 under "sound"-node the subnode property and subnode names have to be
  39 prefixed with "simple-audio-card,"-prefix.
  40
  41 Required dai-link subnodes:
  42
  43 - cpu                                   : CPU   sub-node
  44 - codec                                 : CODEC sub-node
  45
  46 Optional dai-link subnode properties:
  47
  48 - format                                : CPU/CODEC common audio format.
  49                                           "i2s", "right_j", "left_j" , "dsp_a"
  50                                           "dsp_b", "ac97", "pdm", "msb", "lsb"
  51 - frame-master                          : Indicates dai-link frame master.
  52                                           phandle to a cpu or codec subnode.
  53 - bitclock-master                       : Indicates dai-link bit clock master.
  54                                           phandle to a cpu or codec subnode.
  55 - bitclock-inversion                    : bool property. Add this if the
  56                                           dai-link uses bit clock inversion.
  57 - frame-inversion                       : bool property. Add this if the
  58                                           dai-link uses frame clock inversion.
  59 - mclk-fs                               : Multiplication factor between stream
  60                                           rate and codec mclk, applied only for
  61                                           the dai-link.
  62
  63 For backward compatibility the frame-master and bitclock-master
  64 properties can be used as booleans in codec subnode to indicate if the
  65 codec is the dai-link frame or bit clock master. In this case there
  66 should be no dai-link node, the same properties should not be present
  67 at sound-node level, and the bitclock-inversion and frame-inversion
  68 properties should also be placed in the codec node if needed.
  69
  70 Required CPU/CODEC subnodes properties:
  71
  72 - sound-dai                             : phandle and port of CPU/CODEC
  73
  74 Optional CPU/CODEC subnodes properties:
  75
  76 - dai-tdm-slot-num                      : Please refer to tdm-slot.txt.
  77 - dai-tdm-slot-width                    : Please refer to tdm-slot.txt.
  78 - clocks / system-clock-frequency       : specify subnode's clock if needed.
  79                                           it can be specified via "clocks" if system has
  80                                           clock node (= common clock), or "system-clock-frequency"
  81                                           (if system doens't support common clock)
  82                                           If a clock is specified, it is
  83                                           enabled with clk_prepare_enable()
  84                                           in dai startup() and disabled with
  85                                           clk_disable_unprepare() in dai
  86                                           shutdown().
  87
  88 Example 1 - single DAI link:
  89
  90 sound {
  91         compatible = "simple-audio-card";
  92         simple-audio-card,name = "VF610-Tower-Sound-Card";
  93         simple-audio-card,format = "left_j";
  94         simple-audio-card,bitclock-master = <&dailink0_master>;
  95         simple-audio-card,frame-master = <&dailink0_master>;
  96         simple-audio-card,widgets =
  97                 "Microphone", "Microphone Jack",
  98                 "Headphone", "Headphone Jack",
  99                 "Speaker", "External Speaker";
 100         simple-audio-card,routing =
 101                 "MIC_IN", "Microphone Jack",
 102                 "Headphone Jack", "HP_OUT",
 103                 "External Speaker", "LINE_OUT";
 104
 105         simple-audio-card,cpu {
 106                 sound-dai = <&sh_fsi2 0>;
 107         };
 108
 109         dailink0_master: simple-audio-card,codec {
 110                 sound-dai = <&ak4648>;
 111                 clocks = <&osc>;
 112         };
 113 };
 114
 115 &i2c0 {
 116         ak4648: ak4648@12 {
 117                 #sound-dai-cells = <0>;
 118                 compatible = "asahi-kasei,ak4648";
 119                 reg = <0x12>;
 120         };
 121 };
 122
 123 sh_fsi2: sh_fsi2@ec230000 {
 124         #sound-dai-cells = <1>;
 125         compatible = "renesas,sh_fsi2";
 126         reg = <0xec230000 0x400>;
 127         interrupt-parent = <&gic>;
 128         interrupts = <0 146 0x4>;
 129 };
 130
 131 Example 2 - many DAI links:
 132
 133 sound {
 134         compatible = "simple-audio-card";
 135         simple-audio-card,name = "Cubox Audio";
 136
 137         simple-audio-card,dai-link@0 {          /* I2S - HDMI */
 138                 format = "i2s";
 139                 cpu {
 140                         sound-dai = <&audio1 0>;
 141                 };
 142                 codec {
 143                         sound-dai = <&tda998x 0>;
 144                 };
 145         };
 146
 147         simple-audio-card,dai-link@1 {          /* S/PDIF - HDMI */
 148                 cpu {
 149                         sound-dai = <&audio1 1>;
 150                 };
 151                 codec {
 152                         sound-dai = <&tda998x 1>;
 153                 };
 154         };
 155
 156         simple-audio-card,dai-link@2 {          /* S/PDIF - S/PDIF */
 157                 cpu {
 158                         sound-dai = <&audio1 1>;
 159                 };
 160                 codec {
 161                         sound-dai = <&spdif_codec>;
 162                 };
 163         };
 164 };