* ARC Performance Monitor Unit

The ARC 700 can be configured with a pipeline performance monitor for counting
CPU and cache events like cache misses and hits.

Note that:
 * ARC 700 refers to a family of ARC processor cores;
   - There is only one type of PMU available for the whole family;
   - The PMU may support different sets of events; supported events are probed
     at boot time, as required by the reference manual.

 * The ARC 700 PMU does not support interrupts; although HW events may be
   counted, the HW events themselves cannot serve as a trigger for a sample.

Required properties:

- compatible : should contain
	"snps,arc700-pmu"

Example:

pmu {
        compatible = "snps,arc700-pmu";
};

Add documentation on DT binding for ARC700 PMU
ARC: Add documentation on DT binding for ARC700 PMU

Signed-off-by: Mischa Jonker <17dd7bf52eefcca323aba1679f480e7f18d70ddd@synopsys.com>
Acked-by: Mark Rutland <1db9dd262beaa64f35756dd39531d9747b7778bb@arm.com>
Signed-off-by: Vineet Gupta <af669d95a4c0de051445d4cafdbb2c5c4a2838be@synopsys.com>
