On Thu, Nov 15, 2018 at 12:13:33PM +0800, Cheng-Yi Chiang wrote: > +++ b/Documentation/devicetree/bindings/sound/rt5663.txt > @@ -36,6 +36,9 @@ Optional properties: > "realtek,impedance_sensing_num" is 2. It means that there are 2 ranges of > impedance in the impedance sensing function. > > +- avdd-supply: Power supply for AVDD, providing 1.8V. > +- cpvdd-supply: Power supply for CPVDD, providing 3.5V. > +
These should be mandatory properties, the device is going to need power to work. The regulator API will handle incompletely specified boards for you, that's not a problem.
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