Documentation/devicetree/bindings/sound/sun8i-a33-codec.txt

   1 Allwinner SUN8I audio codec
   2 ------------------------------------
   3
   4 On Sun8i-A33 SoCs, the audio is separated in different parts:
   5           - A DAI driver. It uses the "sun4i-i2s" driver which is
   6           documented here:
   7           Documentation/devicetree/bindings/sound/sun4i-i2s.txt
   8           - An analog part of the codec which is handled as PRCM registers.
   9           See Documentation/devicetree/bindings/sound/sun8i-codec-analog.txt
  10           - An digital part of the codec which is documented in this current
  11           binding documentation.
  12           - And finally, an audio card which links all the above components.
  13           The simple-audio card will be used.
  14           See Documentation/devicetree/bindings/sound/simple-card.txt
  15
  16 This bindings documentation exposes Sun8i codec (digital part).
  17
  18 Required properties:
  19 - compatible: must be "allwinner,sun8i-a33-codec"
  20 - reg: must contain the registers location and length
  21 - interrupts: must contain the codec interrupt
  22 - clocks: a list of phandle + clock-specifer pairs, one for each entry
  23   in clock-names.
  24 - clock-names: should contain followings:
  25    - "bus": the parent APB clock for this controller
  26    - "mod": the parent module clock
  27
  28 Here is an example to add a sound card and the codec binding on sun8i SoCs that
  29 are similar to A33 using simple-card:
  30
  31         sound {
  32                 compatible = "simple-audio-card";
  33                 simple-audio-card,name = "sun8i-a33-audio";
  34                 simple-audio-card,format = "i2s";
  35                 simple-audio-card,frame-master = <&link_codec>;
  36                 simple-audio-card,bitclock-master = <&link_codec>;
  37                 simple-audio-card,mclk-fs = <512>;
  38                 simple-audio-card,aux-devs = <&codec_analog>;
  39                 simple-audio-card,routing =
  40                                 "Left DAC", "Digital Left DAC",
  41                                 "Right DAC", "Digital Right DAC";
  42
  43                 simple-audio-card,cpu {
  44                         sound-dai = <&dai>;
  45                 };
  46
  47                 link_codec: simple-audio-card,codec {
  48                         sound-dai = <&codec>;
  49                 };
  50
  51         soc@1c00000 {
  52                 [...]
  53
  54                 audio-codec@1c22e00 {
  55                         #sound-dai-cells = <0>;
  56                         compatible = "allwinner,sun8i-a33-codec";
  57                         reg = <0x01c22e00 0x400>;
  58                         interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>;
  59                         clocks = <&ccu CLK_BUS_CODEC>, <&ccu CLK_AC_DIG>;
  60                         clock-names = "bus", "mod";
  61                 };
  62         };
  63