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IBM POWERNV platform sensors
----------------------------

Required node properties:
- compatible: must be one of
		"ibm,opal-sensor-cooling-fan"
		"ibm,opal-sensor-amb-temp"
		"ibm,opal-sensor-power-supply"
		"ibm,opal-sensor-power"
- sensor-id: an opaque id provided by the firmware to the kernel, identifies a
	     given sensor and its attribute data

Example sensors node:

cooling-fan#8-data {
	sensor-id = <0x7052107>;
	compatible = "ibm,opal-sensor-cooling-fan";
};

amb-temp#1-thrs {
	sensor-id = <0x5096000>;
	compatible = "ibm,opal-sensor-amb-temp";
};