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Holt Integrated Circuits HI-8435 threshold detector bindings

Required properties:
 - compatible: should be "holt,hi8435"
 - reg: spi chip select number for the device

Recommended properties:
 - spi-max-frequency: definition as per
		Documentation/devicetree/bindings/spi/spi-bus.txt

Optional properties:
 - gpios: GPIO used for controlling the reset pin

Example:
sensor@0 {
	compatible = "holt,hi8435";
	reg = <0>;
	gpios = <&gpio6 1 0>;

	spi-max-frequency = <1000000>;
};