* Atlas Scientific pH-SM OEM sensor

http://www.atlas-scientific.com/_files/_datasheets/_oem/pH_oem_datasheet.pdf

Required properties:

  - compatible: must be "atlas,ph-sm"
  - reg: the I2C address of the sensor
  - interrupts: the sole interrupt generated by the device

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

Example:

atlas@65 {
	compatible = "atlas,ph-sm";
	reg = <0x65>;
	interrupt-parent = <&gpio1>;
	interrupts = <16 2>;
};