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 - simple-audio-card,aux-devs            : List of phandles pointing to auxiliary devices, such
  26                                           as amplifiers, to be added to the sound card.
  27
  28 Optional subnodes:
  29
  30 - simple-audio-card,dai-link            : Container for dai-link level
  31                                           properties and the CPU and CODEC
  32                                           sub-nodes. This container may be
  33                                           omitted when the card has only one
  34                                           DAI link. See the examples and the
  35                                           section below.
  36
  37 Dai-link subnode properties and subnodes:
  38
  39 If dai-link subnode is omitted and the subnode properties are directly
  40 under "sound"-node the subnode property and subnode names have to be
  41 prefixed with "simple-audio-card,"-prefix.
  42
  43 Required dai-link subnodes:
  44
  45 - cpu                                   : CPU   sub-node
  46 - codec                                 : CODEC sub-node
  47
  48 Optional dai-link subnode properties:
  49
  50 - format                                : CPU/CODEC common audio format.
  51                                           "i2s", "right_j", "left_j" , "dsp_a"
  52                                           "dsp_b", "ac97", "pdm", "msb", "lsb"
  53 - frame-master                          : Indicates dai-link frame master.
  54                                           phandle to a cpu or codec subnode.
  55 - bitclock-master                       : Indicates dai-link bit clock master.
  56                                           phandle to a cpu or codec subnode.
  57 - bitclock-inversion                    : bool property. Add this if the
  58                                           dai-link uses bit clock inversion.
  59 - frame-inversion                       : bool property. Add this if the
  60                                           dai-link uses frame clock inversion.
  61 - mclk-fs                               : Multiplication factor between stream
  62                                           rate and codec mclk, applied only for
  63                                           the dai-link.
  64
  65 For backward compatibility the frame-master and bitclock-master
  66 properties can be used as booleans in codec subnode to indicate if the
  67 codec is the dai-link frame or bit clock master. In this case there
  68 should be no dai-link node, the same properties should not be present
  69 at sound-node level, and the bitclock-inversion and frame-inversion
  70 properties should also be placed in the codec node if needed.
  71
  72 Required CPU/CODEC subnodes properties:
  73
  74 - sound-dai                             : phandle and port of CPU/CODEC
  75
  76 Optional CPU/CODEC subnodes properties:
  77
  78 - dai-tdm-slot-num                      : Please refer to tdm-slot.txt.
  79 - dai-tdm-slot-width                    : Please refer to tdm-slot.txt.
  80 - clocks / system-clock-frequency       : specify subnode's clock if needed.
  81                                           it can be specified via "clocks" if system has
  82                                           clock node (= common clock), or "system-clock-frequency"
  83                                           (if system doens't support common clock)
  84                                           If a clock is specified, it is
  85                                           enabled with clk_prepare_enable()
  86                                           in dai startup() and disabled with
  87                                           clk_disable_unprepare() in dai
  88                                           shutdown().
  89
  90 Example 1 - single DAI link:
  91
  92 sound {
  93         compatible = "simple-audio-card";
  94         simple-audio-card,name = "VF610-Tower-Sound-Card";
  95         simple-audio-card,format = "left_j";
  96         simple-audio-card,bitclock-master = <&dailink0_master>;
  97         simple-audio-card,frame-master = <&dailink0_master>;
  98         simple-audio-card,widgets =
  99                 "Microphone", "Microphone Jack",
 100                 "Headphone", "Headphone Jack",
 101                 "Speaker", "External Speaker";
 102         simple-audio-card,routing =
 103                 "MIC_IN", "Microphone Jack",
 104                 "Headphone Jack", "HP_OUT",
 105                 "External Speaker", "LINE_OUT";
 106
 107         simple-audio-card,cpu {
 108                 sound-dai = <&sh_fsi2 0>;
 109         };
 110
 111         dailink0_master: simple-audio-card,codec {
 112                 sound-dai = <&ak4648>;
 113                 clocks = <&osc>;
 114         };
 115 };
 116
 117 &i2c0 {
 118         ak4648: ak4648@12 {
 119                 #sound-dai-cells = <0>;
 120                 compatible = "asahi-kasei,ak4648";
 121                 reg = <0x12>;
 122         };
 123 };
 124
 125 sh_fsi2: sh_fsi2@ec230000 {
 126         #sound-dai-cells = <1>;
 127         compatible = "renesas,sh_fsi2";
 128         reg = <0xec230000 0x400>;
 129         interrupt-parent = <&gic>;
 130         interrupts = <0 146 0x4>;
 131 };
 132
 133 Example 2 - many DAI links:
 134
 135 sound {
 136         compatible = "simple-audio-card";
 137         simple-audio-card,name = "Cubox Audio";
 138
 139         simple-audio-card,dai-link@0 {          /* I2S - HDMI */
 140                 format = "i2s";
 141                 cpu {
 142                         sound-dai = <&audio1 0>;
 143                 };
 144                 codec {
 145                         sound-dai = <&tda998x 0>;
 146                 };
 147         };
 148
 149         simple-audio-card,dai-link@1 {          /* S/PDIF - HDMI */
 150                 cpu {
 151                         sound-dai = <&audio1 1>;
 152                 };
 153                 codec {
 154                         sound-dai = <&tda998x 1>;
 155                 };
 156         };
 157
 158         simple-audio-card,dai-link@2 {          /* S/PDIF - S/PDIF */
 159                 cpu {
 160                         sound-dai = <&audio1 1>;
 161                 };
 162                 codec {
 163                         sound-dai = <&spdif_codec>;
 164                 };
 165         };
 166 };
 167
 168 Example 3 - route audio from IMX6 SSI2 through TLV320DAC3100 codec
 169 through TPA6130A2 amplifier to headphones:
 170
 171 &i2c0 {
 172         codec: tlv320dac3100@18 {
 173                 compatible = "ti,tlv320dac3100";
 174                 ...
 175         }
 176
 177         amp: tpa6130a2@60 {
 178                 compatible = "ti,tpa6130a2";
 179                 ...
 180         }
 181 }
 182
 183 sound {
 184         compatible = "simple-audio-card";
 185         ...
 186         simple-audio-card,widgets =
 187                 "Headphone", "Headphone Jack";
 188         simple-audio-card,routing =
 189                 "Headphone Jack", "HPLEFT",
 190                 "Headphone Jack", "HPRIGHT",
 191                 "LEFTIN", "HPL",
 192                 "RIGHTIN", "HPR";
 193         simple-audio-card,aux-devs = <&amp>;
 194         simple-audio-card,cpu {
 195                 sound-dai = <&ssi2>;
 196         };
 197         simple-audio-card,codec {
 198                 sound-dai = <&codec>;
 199                 clocks = ...
 200         };
 201 };