xref: /freebsd/sys/contrib/device-tree/Bindings/sound/max98504.txt (revision 7ef62cebc2f965b0f640263e179276928885e33d) 
1Maxim MAX98504 class D mono speaker amplifier
2
3This device supports I2C control interface and an IRQ output signal. It features
4a PCM and PDM digital audio interface (DAI) and a differential analog input.
5
6Required properties:
7
8 - compatible : "maxim,max98504"
9 - reg : should contain the I2C slave device address
10 - DVDD-supply, DIOVDD-supply, PVDD-supply: power supplies for the device,
11   as covered in ../regulator/regulator.txt
12 - interrupts : should specify the interrupt line the device is connected to,
13   as described in ../interrupt-controller/interrupts.txt
14
15Optional properties:
16
17 - maxim,brownout-threshold - the PVDD brownout threshold, the value must be
18   from 0, 1...21 range, corresponding to 2.6V, 2.65V...3.65V voltage range
19 - maxim,brownout-attenuation - the brownout attenuation to the speaker gain
20   applied during the "attack hold" and "timed hold" phase, the value must be
21   from 0...6 (dB) range
22 - maxim,brownout-attack-hold-ms - the brownout attack hold phase time in ms,
23   0...255 (VBATBROWN_ATTK_HOLD, register 0x0018)
24 - maxim,brownout-timed-hold-ms - the brownout timed hold phase time in ms,
25   0...255 (VBATBROWN_TIME_HOLD, register 0x0019)
26 - maxim,brownout-release-rate-ms - the brownout release phase step time in ms,
27   0...255 (VBATBROWN_RELEASE, register 0x001A)
28
29The default value when the above properties are not specified is 0,
30the maxim,brownout-threshold property must be specified to actually enable
31the PVDD brownout protection.
32
33Example:
34
35 max98504@31 {
36	compatible = "maxim,max98504";
37	reg = <0x31>;
38	interrupt-parent = <&gpio_bank_0>;
39	interrupts = <2 0>;
40
41	DVDD-supply = <&regulator>;
42	DIOVDD-supply = <&regulator>;
43	PVDD-supply = <&regulator>;
44};
45