FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/sound/cs42l42.txt

     CS42L42 audio CODEC
     
     Required properties:
     
       - compatible : "cirrus,cs42l42"
     
       - reg : the I2C address of the device for I2C.
     
       - VP-supply, VCP-supply, VD_FILT-supply, VL-supply, VA-supply :
      power supplies for the device, as covered in
      Documentation/devicetree/bindings/regulator/regulator.txt.
    
    Optional properties:
    
      - reset-gpios : a GPIO spec for the reset pin. If specified, it will be
      deasserted before communication to the codec starts.
    
      - interrupts : IRQ line info CS42L42.
      (See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
      for further information relating to interrupt properties)
    
      - cirrus,ts-inv : Boolean property. Sets the behaviour of the jack plug
      detect switch.
    
      0 = (Default) Shorted to tip when unplugged, open when plugged.
          This is "inverted tip sense (ITS)" in the datasheet.
    
      1 = Open when unplugged, shorted to tip when plugged.
          This is "normal tip sense (TS)" in the datasheet.
    
      - cirrus,ts-dbnc-rise : Debounce the rising edge of TIP_SENSE_PLUG. With no
      debounce, the tip sense pin might be noisy on a plug event.
    
      0 - 0ms,
      1 - 125ms,
      2 - 250ms,
      3 - 500ms,
      4 - 750ms,
      5 - (Default) 1s,
      6 - 1.25s,
      7 - 1.5s,
    
      - cirrus,ts-dbnc-fall : Debounce the falling edge of TIP_SENSE_UNPLUG.
      With no debounce, the tip sense pin might be noisy on an unplug event.
    
      0 - 0ms,
      1 - 125ms,
      2 - 250ms,
      3 - 500ms,
      4 - 750ms,
      5 - (Default) 1s,
      6 - 1.25s,
      7 - 1.5s,
    
      - cirrus,btn-det-init-dbnce : This sets how long the driver sleeps after
      enabling button detection interrupts. After auto-detection and before
      servicing button interrupts, the HS bias needs time to settle. If you
      don't wait, there is possibility for erroneous button interrupt.
    
      0ms - 200ms,
      Default = 100ms
    
      - cirrus,btn-det-event-dbnce : This sets how long the driver delays after
      receiving a button press interrupt. With level detect interrupts, you want
      to wait a small amount of time to make sure the button press is making a
      clean connection with the bias resistors.
    
      0ms - 20ms,
      Default = 10ms
    
      - cirrus,bias-lvls : For a level-detect headset button scheme, each button
      will bias the mic pin to a certain voltage. To determine which button was
      pressed, the driver will compare this biased voltage to sequential,
      decreasing voltages and will stop when a comparator is tripped,
      indicating a comparator voltage < bias voltage. This value represents a
      percentage of the internally generated HS bias voltage. For different
      hardware setups, a designer might want to tweak this. This is an array of
      descending values for the comparator voltage.
    
      Array of 4 values
      Each 0-63
      < x1 x2 x3 x4 >
      Default = < 15 8 4 1>
    
      - cirrus,hs-bias-sense-disable: This is boolean property. If present the
      HSBIAS sense is disabled. Configures HSBIAS output current sense through
      the external 2.21-k resistor. HSBIAS_SENSE is hardware feature to reduce
      the potential pop noise during the headset plug out slowly. But on some
      platforms ESD voltage will affect it causing test to fail, especially
      with CTIA headset type. For different hardware setups, a designer might
      want to tweak default behavior.
    
    Example:
    
    cs42l42: cs42l42@48 {
            compatible = "cirrus,cs42l42";
            reg = <0x48>;
            VA-supply = <&dummy_vreg>;
            VP-supply = <&dummy_vreg>;
           VCP-supply = <&dummy_vreg>;
           VD_FILT-supply = <&dummy_vreg>;
           VL-supply = <&dummy_vreg>;
   
           reset-gpios = <&axi_gpio_0 1 0>;
           interrupt-parent = <&gpio0>;
           interrupts = <55 8>
   
           cirrus,ts-inv = <0x00>;
           cirrus,ts-dbnc-rise = <0x05>;
           cirrus,ts-dbnc-fall = <0x00>;
           cirrus,btn-det-init-dbnce = <100>;
           cirrus,btn-det-event-dbnce = <10>;
           cirrus,bias-lvls = <0x0F 0x08 0x04 0x01>;
           cirrus,hs-bias-ramp-rate = <0x02>;
   };

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