linux/Documentation/devicetree/bindings/gpio/gpio-stmpe.txt
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   1STMPE gpio
   2----------
   3
   4Required properties:
   5 - compatible: "st,stmpe-gpio"
   6
   7Optional properties:
   8 - st,norequest-mask: bitmask specifying which GPIOs should _not_ be requestable
   9   due to different usage (e.g. touch, keypad)
  10
  11Node name must be stmpe_gpio and should be child node of stmpe node to which it
  12belongs.
  13
  14Example:
  15        stmpe_gpio {
  16                compatible = "st,stmpe-gpio";
  17                st,norequest-mask = <0x20>;     //gpio 5 can't be used
  18        };
  19