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* AMS/TAOS ALS and proximity sensor

Required properties:

  - compatible: Should be one of
		"amstaos,tsl2571"
		"amstaos,tsl2671"
		"amstaos,tmd2671"
		"amstaos,tsl2771"
		"amstaos,tmd2771"
		"amstaos,tsl2572"
		"amstaos,tsl2672"
		"amstaos,tmd2672"
		"amstaos,tsl2772"
		"amstaos,tmd2772"
		"avago,apds9930"
  - reg: the I2C address of the device

Optional properties:

  - amstaos,proximity-diodes - proximity diodes to enable. <0>, <1>, or <0 1>
                               are the only valid values.
  - led-max-microamp - current for the proximity LED. Must be 100000, 50000,
                       25000, or 13000.
  - vdd-supply: phandle to the regulator that provides power to the sensor.
  - vddio-supply: phandle to the regulator that provides power to the bus.
  - interrupts: the sole interrupt generated by the device

  Refer to interrupt-controller/interrupts.txt for generic interrupt client
  node bindings.

Example:

tsl2772@39 {
	compatible = "amstaos,tsl2772";
	reg = <0x39>;
	interrupts-extended = <&msmgpio 61 IRQ_TYPE_EDGE_FALLING>;
	vdd-supply = <&pm8941_l17>;
	vddio-supply = <&pm8941_lvs1>;
	amstaos,proximity-diodes = <0>;
	led-max-microamp = <100000>;
};