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STMPE gpio
----------
Required properties:
- compatible: "st,stmpe-gpio"
Optional properties:
- st,norequest-mask: bitmask specifying which GPIOs should _not_ be requestable
due to different usage (e.g. touch, keypad)
Node should be child node of stmpe node to which it belongs.
Example:
stmpe_gpio {
compatible = "st,stmpe-gpio";
st,norequest-mask = <0x20>; //gpio 5 can't be used
};
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