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STMPE ADC driver
----------------
Required properties:
- compatible: "st,stmpe-adc"
Optional properties:
Note that the ADC is shared with the STMPE touchscreen, so if using both the
settings should be the same.
If they are not, the last one to be initialized will win.
- st,sample-time: ADC converstion time in number of clock. (0 -> 36 clocks, 1 ->
44 clocks, 2 -> 56 clocks, 3 -> 64 clocks, 4 -> 80 clocks, 5 -> 96 clocks, 6
-> 144 clocks), recommended is 4.
- st,mod-12b: ADC Bit mode (0 -> 10bit ADC, 1 -> 12bit ADC)
- st,ref-sel: ADC reference source (0 -> internal reference, 1 -> external
reference)
- st,adc-freq: ADC Clock speed (0 -> 1.625 MHz, 1 -> 3.25 MHz, 2 || 3 -> 6.5 MHz)
Node name must be stmpe_adc and should be child node of stmpe node to
which it belongs.
Example:
stmpe_adc {
compatible = "st,stmpe-adc";
st,sample-time = <4>;
st,mod-12b = <1>;
st,ref-sel = <0>;
st,adc-freq = <1>;
};
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