1CS42L42 audio CODEC
2
3Required properties:
4
5  - compatible : "cirrus,cs42l42"
6
7  - reg : the I2C address of the device for I2C.
8
9  - VP-supply, VCP-supply, VD_FILT-supply, VL-supply, VA-supply :
10  power supplies for the device, as covered in
11  Documentation/devicetree/bindings/regulator/regulator.txt.
12
13Optional properties:
14
15  - reset-gpios : a GPIO spec for the reset pin. If specified, it will be
16  deasserted before communication to the codec starts.
17
18  - interrupts : IRQ line info CS42L42.
19  (See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
20  for further information relating to interrupt properties)
21
22  - cirrus,ts-inv : Boolean property. For jacks that invert the tip sense
23  polarity. Normal jacks will short tip sense pin to HS1 when headphones are
24  plugged in and leave tip sense floating when not plugged in. Inverting jacks
25  short tip sense when unplugged and float when plugged in.
26
27  0 = (Default) Non-inverted
28  1 = Inverted
29
30  - cirrus,ts-dbnc-rise : Debounce the rising edge of TIP_SENSE_PLUG. With no
31  debounce, the tip sense pin might be noisy on a plug event.
32
33  0 - 0ms,
34  1 - 125ms,
35  2 - 250ms,
36  3 - 500ms,
37  4 - 750ms,
38  5 - (Default) 1s,
39  6 - 1.25s,
40  7 - 1.5s,
41
42  - cirrus,ts-dbnc-fall : Debounce the falling edge of TIP_SENSE_UNPLUG.
43  With no debounce, the tip sense pin might be noisy on an unplug event.
44
45  0 - 0ms,
46  1 - 125ms,
47  2 - 250ms,
48  3 - 500ms,
49  4 - 750ms,
50  5 - (Default) 1s,
51  6 - 1.25s,
52  7 - 1.5s,
53
54  - cirrus,btn-det-init-dbnce : This sets how long the driver sleeps after
55  enabling button detection interrupts. After auto-detection and before
56  servicing button interrupts, the HS bias needs time to settle. If you
57  don't wait, there is possibility for erroneous button interrupt.
58
59  0ms - 200ms,
60  Default = 100ms
61
62  - cirrus,btn-det-event-dbnce : This sets how long the driver delays after
63  receiving a button press interrupt. With level detect interrupts, you want
64  to wait a small amount of time to make sure the button press is making a
65  clean connection with the bias resistors.
66
67  0ms - 20ms,
68  Default = 10ms
69
70  - cirrus,bias-lvls : For a level-detect headset button scheme, each button
71  will bias the mic pin to a certain voltage. To determine which button was
72  pressed, the driver will compare this biased voltage to sequential,
73  decreasing voltages and will stop when a comparator is tripped,
74  indicating a comparator voltage < bias voltage. This value represents a
75  percentage of the internally generated HS bias voltage. For different
76  hardware setups, a designer might want to tweak this. This is an array of
77  descending values for the comparator voltage.
78
79  Array of 4 values
80  Each 0-63
81  < x1 x2 x3 x4 >
82  Default = < 15 8 4 1>
83
84  - cirrus,hs-bias-sense-disable: This is boolean property. If present the
85  HSBIAS sense is disabled. Configures HSBIAS output current sense through
86  the external 2.21-k resistor. HSBIAS_SENSE is hardware feature to reduce
87  the potential pop noise during the headset plug out slowly. But on some
88  platforms ESD voltage will affect it causing test to fail, especially
89  with CTIA headset type. For different hardware setups, a designer might
90  want to tweak default behavior.
91
92Example:
93
94cs42l42: cs42l42@48 {
95	compatible = "cirrus,cs42l42";
96	reg = <0x48>;
97	VA-supply = <&dummy_vreg>;
98	VP-supply = <&dummy_vreg>;
99	VCP-supply = <&dummy_vreg>;
100	VD_FILT-supply = <&dummy_vreg>;
101	VL-supply = <&dummy_vreg>;
102
103	reset-gpios = <&axi_gpio_0 1 0>;
104	interrupt-parent = <&gpio0>;
105	interrupts = <55 8>
106
107	cirrus,ts-inv = <0x00>;
108	cirrus,ts-dbnc-rise = <0x05>;
109	cirrus,ts-dbnc-fall = <0x00>;
110	cirrus,btn-det-init-dbnce = <100>;
111	cirrus,btn-det-event-dbnce = <10>;
112	cirrus,bias-lvls = <0x0F 0x08 0x04 0x01>;
113	cirrus,hs-bias-ramp-rate = <0x02>;
114};
115