Add a compatible string for the Cavium ThunderX PMU.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
        "qcom,scorpion-pmu"
        "qcom,scorpion-mp-pmu"
        "qcom,krait-pmu"
+       "cavium,thunder-pmu"
 - interrupts : 1 combined interrupt or 1 per core. If the interrupt is a per-cpu
                interrupt (PPI) then 1 interrupt should be specified.
 
 
                             <1 10 0xff01>;
        };
 
+       pmu {
+               compatible = "cavium,thunder-pmu", "arm,armv8-pmuv3";
+               interrupts = <1 7 4>;
+       };
+
        soc {
                compatible = "simple-bus";
                #address-cells = <2>;