Maxim MAX98504 class D mono speaker amplifier This device supports I2C control interface and an IRQ output signal. It features a PCM and PDM digital audio interface (DAI) and a differential analog input. Required properties: - compatible : "maxim,max98504" - reg : should contain the I2C slave device address - DVDD-supply, DIOVDD-supply, PVDD-supply: power supplies for the device, as covered in ../regulator/regulator.txt - interrupts : should specify the interrupt line the device is connected to, as described in ../interrupt-controller/interrupts.txt Optional properties: - maxim,brownout-threshold - the PVDD brownout threshold, the value must be from 0, 1...21 range, corresponding to 2.6V, 2.65V...3.65V voltage range - maxim,brownout-attenuation - the brownout attenuation to the speaker gain applied during the "attack hold" and "timed hold" phase, the value must be from 0...6 (dB) range - maxim,brownout-attack-hold-ms - the brownout attack hold phase time in ms, 0...255 (VBATBROWN_ATTK_HOLD, register 0x0018) - maxim,brownout-timed-hold-ms - the brownout timed hold phase time in ms, 0...255 (VBATBROWN_TIME_HOLD, register 0x0019) - maxim,brownout-release-rate-ms - the brownout release phase step time in ms, 0...255 (VBATBROWN_RELEASE, register 0x001A) The default value when the above properties are not specified is 0, the maxim,brownout-threshold property must be specified to actually enable the PVDD brownout protection. Example: max98504@31 { compatible = "maxim,max98504"; reg = <0x31>; interrupt-parent = <&gpio_bank_0>; interrupts = <2 0>; DVDD-supply = <®ulator>; DIOVDD-supply = <®ulator>; PVDD-supply = <®ulator>; };