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IBM OPAL Sensor Groups Binding
-------------------------------

Node: /ibm,opal/sensor-groups

Description: Contains sensor groups available in the Powernv P9
servers. Each child node indicates a sensor group.

- compatible : Should be "ibm,opal-sensor-group"

Each child node contains below properties:

- type : String to indicate the type of sensor-group

- sensor-group-id: Abstract unique identifier provided by firmware of
		   type <u32> which is used for sensor-group
		   operations like clearing the min/max history of all
		   sensors belonging to the group.

- ibm,chip-id : Chip ID

- sensors : Phandle array of child nodes of /ibm,opal/sensor/
	    belonging to this group

- ops : Array of opal-call numbers indicating available operations on
	sensor groups like clearing min/max, enabling/disabling sensor
	group.