Required properties:
- compatible : should be one of
+ "arm,cortex-a15-pmu"
"arm,cortex-a9-pmu"
"arm,cortex-a8-pmu"
+ "arm,cortex-a7-pmu"
+ "arm,cortex-a5-pmu"
+ "arm,arm11mpcore-pmu"
"arm,arm1176-pmu"
"arm,arm1136-pmu"
- interrupts : 1 combined interrupt or 1 per core.