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 = <®ulator>; 42 DIOVDD-supply = <®ulator>; 43 PVDD-supply = <®ulator>; 44}; 45