ASoC: cs42l42: Add devicetree bindings for CS42L42

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.

  - interrupt-parent : Specifies the phandle of the interrupt controller to

  which the IRQs from CS42L42 are delivered to.

  - 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. For jacks that invert the tip sense

  polarity. Normal jacks will short tip sense pin to HS1 when headphones are

  plugged in and leave tip sense floating when not plugged in. Inverting jacks

  short tip sense when unplugged and float when plugged in.

  0 = (Default) Non-inverted

  1 = Inverted

  - 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>

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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