3 Optional properties for child nodes:
4 - bipolar : Boolean, if set the channel is used in bipolar mode.
5 - diff-channels : Differential channels muxed for this ADC. The first value
6 specifies the positive input pin, the second value the negative
11 compatible = "some,adc";
15 diff-channels = <0 1>;
20 diff-channels = <2 3>;