110 lines
3.3 KiB
Plaintext
110 lines
3.3 KiB
Plaintext
CS42L42 audio CODEC
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Required properties:
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- compatible : "cirrus,cs42l42"
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- reg : the I2C address of the device for I2C.
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- VP-supply, VCP-supply, VD_FILT-supply, VL-supply, VA-supply :
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power supplies for the device, as covered in
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Documentation/devicetree/bindings/regulator/regulator.txt.
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Optional properties:
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- reset-gpios : a GPIO spec for the reset pin. If specified, it will be
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deasserted before communication to the codec starts.
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- interrupt-parent : Specifies the phandle of the interrupt controller to
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which the IRQs from CS42L42 are delivered to.
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- interrupts : IRQ line info CS42L42.
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(See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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for further information relating to interrupt properties)
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- cirrus,ts-inv : Boolean property. For jacks that invert the tip sense
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polarity. Normal jacks will short tip sense pin to HS1 when headphones are
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plugged in and leave tip sense floating when not plugged in. Inverting jacks
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short tip sense when unplugged and float when plugged in.
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0 = (Default) Non-inverted
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1 = Inverted
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- cirrus,ts-dbnc-rise : Debounce the rising edge of TIP_SENSE_PLUG. With no
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debounce, the tip sense pin might be noisy on a plug event.
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0 - 0ms,
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1 - 125ms,
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2 - 250ms,
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3 - 500ms,
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4 - 750ms,
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5 - (Default) 1s,
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6 - 1.25s,
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7 - 1.5s,
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- cirrus,ts-dbnc-fall : Debounce the falling edge of TIP_SENSE_UNPLUG.
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With no debounce, the tip sense pin might be noisy on an unplug event.
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0 - 0ms,
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1 - 125ms,
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2 - 250ms,
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3 - 500ms,
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4 - 750ms,
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5 - (Default) 1s,
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6 - 1.25s,
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7 - 1.5s,
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- cirrus,btn-det-init-dbnce : This sets how long the driver sleeps after
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enabling button detection interrupts. After auto-detection and before
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servicing button interrupts, the HS bias needs time to settle. If you
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don't wait, there is possibility for erroneous button interrupt.
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0ms - 200ms,
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Default = 100ms
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- cirrus,btn-det-event-dbnce : This sets how long the driver delays after
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receiving a button press interrupt. With level detect interrupts, you want
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to wait a small amount of time to make sure the button press is making a
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clean connection with the bias resistors.
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0ms - 20ms,
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Default = 10ms
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- cirrus,bias-lvls : For a level-detect headset button scheme, each button
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will bias the mic pin to a certain voltage. To determine which button was
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pressed, the driver will compare this biased voltage to sequential,
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decreasing voltages and will stop when a comparator is tripped,
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indicating a comparator voltage < bias voltage. This value represents a
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percentage of the internally generated HS bias voltage. For different
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hardware setups, a designer might want to tweak this. This is an array of
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descending values for the comparator voltage.
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Array of 4 values
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Each 0-63
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< x1 x2 x3 x4 >
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Default = < 15 8 4 1>
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Example:
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cs42l42: cs42l42@48 {
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compatible = "cirrus,cs42l42";
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reg = <0x48>;
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VA-supply = <&dummy_vreg>;
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VP-supply = <&dummy_vreg>;
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VCP-supply = <&dummy_vreg>;
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VD_FILT-supply = <&dummy_vreg>;
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VL-supply = <&dummy_vreg>;
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reset-gpios = <&axi_gpio_0 1 0>;
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interrupt-parent = <&gpio0>;
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interrupts = <55 8>
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cirrus,ts-inv = <0x00>;
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cirrus,ts-dbnc-rise = <0x05>;
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cirrus,ts-dbnc-fall = <0x00>;
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cirrus,btn-det-init-dbnce = <100>;
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cirrus,btn-det-event-dbnce = <10>;
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cirrus,bias-lvls = <0x0F 0x08 0x04 0x01>;
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cirrus,hs-bias-ramp-rate = <0x02>;
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}; |