linux/Documentation/devicetree/bindings/sound/wm8994.txt
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   1WM1811/WM8994/WM8958 audio CODEC
   2
   3These devices support both I2C and SPI (configured with pin strapping
   4on the board).
   5
   6Required properties:
   7
   8  - compatible : One of "wlf,wm1811", "wlf,wm8994" or "wlf,wm8958".
   9
  10  - reg : the I2C address of the device for I2C, the chip select
  11          number for SPI.
  12
  13  - gpio-controller : Indicates this device is a GPIO controller.
  14  - #gpio-cells : Must be 2. The first cell is the pin number and the
  15    second cell is used to specify optional parameters (currently unused).
  16
  17  - AVDD2-supply, DBVDD1-supply, DBVDD2-supply, DBVDD3-supply, CPVDD-supply,
  18    SPKVDD1-supply, SPKVDD2-supply : power supplies for the device, as covered
  19    in Documentation/devicetree/bindings/regulator/regulator.txt
  20
  21Optional properties:
  22
  23  - interrupts : The interrupt line the IRQ signal for the device is
  24    connected to.  This is optional, if it is not connected then none
  25    of the interrupt related properties should be specified.
  26  - interrupt-controller : These devices contain interrupt controllers
  27    and may provide interrupt services to other devices if they have an
  28    interrupt line connected.
  29  - interrupt-parent : The parent interrupt controller.
  30  - #interrupt-cells: the number of cells to describe an IRQ, this should be 2.
  31    The first cell is the IRQ number.
  32    The second cell is the flags, encoded as the trigger masks from
  33    Documentation/devicetree/bindings/interrupts.txt
  34
  35  - wlf,gpio-cfg : A list of GPIO configuration register values. If absent,
  36    no configuration of these registers is performed. If any value is
  37    over 0xffff then the register will be left as default. If present 11
  38    values must be supplied.
  39
  40  - wlf,micbias-cfg : Two MICBIAS register values for WM1811 or
  41    WM8958.  If absent the register defaults will be used.
  42
  43  - wlf,ldo1ena : GPIO specifier for control of LDO1ENA input to device.
  44  - wlf,ldo2ena : GPIO specifier for control of LDO2ENA input to device.
  45
  46  - wlf,lineout1-se : If present LINEOUT1 is in single ended mode.
  47  - wlf,lineout2-se : If present LINEOUT2 is in single ended mode.
  48
  49  - wlf,lineout1-feedback : If present LINEOUT1 has common mode feedback
  50    connected.
  51  - wlf,lineout2-feedback : If present LINEOUT2 has common mode feedback
  52    connected.
  53
  54  - wlf,ldoena-always-driven : If present LDOENA is always driven.
  55
  56Example:
  57
  58codec: wm8994@1a {
  59        compatible = "wlf,wm8994";
  60        reg = <0x1a>;
  61
  62        gpio-controller;
  63        #gpio-cells = <2>;
  64
  65        lineout1-se;
  66
  67        AVDD2-supply = <&regulator>;
  68        CPVDD-supply = <&regulator>;
  69        DBVDD1-supply = <&regulator>;
  70        DBVDD2-supply = <&regulator>;
  71        DBVDD3-supply = <&regulator>;
  72        SPKVDD1-supply = <&regulator>;
  73        SPKVDD2-supply = <&regulator>;
  74};
  75