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+* ARM Performance Monitor Units
+
+ARM cores often have a PMU for counting cpu and cache events like cache misses
+and hits. The interface to the PMU is part of the ARM ARM. The ARM PMU
+representation in the device tree should be done as under:-
+
+Required properties:
+
+- compatible : should be one of
+	"arm,armv8-pmuv3"
+	"arm,cortex-a17-pmu"
+	"arm,cortex-a15-pmu"
+	"arm,cortex-a12-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"
+	"qcom,scorpion-pmu"
+	"qcom,scorpion-mp-pmu"
+	"qcom,krait-pmu"
+- interrupts : 1 combined interrupt or 1 per core. If the interrupt is a per-cpu
+               interrupt (PPI) then 1 interrupt should be specified.
+
+Optional properties:
+
+- interrupt-affinity : Valid only when using SPIs, specifies a list of phandles
+                       to CPU nodes corresponding directly to the affinity of
+		       the SPIs listed in the interrupts property.
+
+		       This property should be present when there is more than
+		       a single SPI.
+
+- qcom,no-pc-write : Indicates that this PMU doesn't support the 0xc and 0xd
+                     events.
+
+Example:
+
+pmu {
+        compatible = "arm,cortex-a9-pmu";
+        interrupts = <100 101>;
+};