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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. ADC related settings
have to be done in the mfd.
- st,norequest-mask: bitmask specifying which ADC channels should _not_ be
requestable due to different usage (e.g. touch)
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,norequest-mask = <0x0F>; /* dont use ADC CH3-0 */
};
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