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2a2df2a755
This swaps the descriptions of the 0 and 1 values to match
what the driver actually does with this property.
The background here is somewhat confusing. The codec has two
invert bits for the tip sense. The DT property should have been
for the TIP_SENSE_INV bit, which is the one that controls the
detect block. Due to some misunderstanding of the hardware the
driver actually implemented setting of the TS_INV bit, which is
only for swapping the sense of the interrupt bits. The description
was taken from the datasheet and refers to TIP_SENSE_INV but
unfortunately TS_INV has a different purpose and the net effect
of changing it is the reverse of what was intended (this is not
clearly described in the datasheet). So the ts-inv settings have
always done the exact opposite of what the description said.
Given the age of the driver, it's too late now to swap the meanings
of the values, so the description is changed to match the behaviour.
They have been annotated with the terminology used in the datasheet
to avoid the confusion of which one corresponds to what the datasheet
calls "inverted tip sense".
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: da16c55793 ("ASoC: cs42l42: Add devicetree bindings for CS42L42")
Link: https://lore.kernel.org/r/20211028140902.11786-2-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
116 lines
3.7 KiB
Plaintext
116 lines
3.7 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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- 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. Sets the behaviour of the jack plug
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detect switch.
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0 = (Default) Shorted to tip when unplugged, open when plugged.
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This is "inverted tip sense (ITS)" in the datasheet.
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1 = Open when unplugged, shorted to tip when plugged.
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This is "normal tip sense (TS)" in the datasheet.
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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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- cirrus,hs-bias-sense-disable: This is boolean property. If present the
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HSBIAS sense is disabled. Configures HSBIAS output current sense through
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the external 2.21-k resistor. HSBIAS_SENSE is hardware feature to reduce
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the potential pop noise during the headset plug out slowly. But on some
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platforms ESD voltage will affect it causing test to fail, especially
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with CTIA headset type. For different hardware setups, a designer might
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want to tweak default behavior.
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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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};
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