Add devicetree bindings documentation file for Cirrus
Logic CS42L42 codec.
Signed-off-by: James Schulman <james.schulman@xxxxxxxxxx>
---
.../devicetree/bindings/sound/cs42l42.txt | 110 +++++++++++++++++++++
1 file changed, 110 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/cs42l42.txt
diff --git a/Documentation/devicetree/bindings/sound/cs42l42.txt b/Documentation/devicetree/bindings/sound/cs42l42.txt
new file mode 100644
index 0000000..9a2c5e2
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/cs42l42.txt
@@ -0,0 +1,110 @@
+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>;
+};
\ No newline at end of file
--
1.9.1
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