On Wed, Nov 7, 2018 at 11:30 PM Chen-Yu Tsai <wens@xxxxxxxx> wrote: > > + > > + speaker_amp: speaker_amp { > > + compatible = "simple-audio-amplifier"; > > + enable-gpios = <&pio 7 7 GPIO_ACTIVE_HIGH>; /* PH7 */ > > You might want to add a sound-name-prefix property. See > > Documentation/devicetree/bindings/sound/name-prefix.txt > > Also this should have a reference to its power supply regulator. You're right, it should reference its power supply which should be a fixed regulator controlled via GPIO from AXP803. Unfortunately there's no AXP803 GPIO support yet and simple-audio-amplifier doesn't have regulator property. I have no time (and interest) to work on it in near future, so if anyone wants to pick it up - feel free to do so. Regards, Vasily