arm64: dts: rockchip: support the pmu node for rk3399

This patch adds to enable the ARM Performance Monitor Units for rk3399.
ARM cores often have a PMU for counting cpu and cache events like cache
misses and hits.

This uses the new interrupt-partition mechanism to allow the two pmu
instances to use the per-cpu interrupt.
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399.dtsi

@@ -153,6 +153,16 @@ cpu_b1: cpu@101 {
 		};
 	};
 
+	pmu_a53 {
+		compatible = "arm,cortex-a53-pmu";
+		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW &ppi_cluster0>;
+	};
+
+	pmu_a72 {
+		compatible = "arm,cortex-a72-pmu";
+		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW &ppi_cluster1>;
+	};
+
 	psci {
 		compatible = "arm,psci-1.0";
 		method = "smc";
@@ -340,6 +350,16 @@ its: interrupt-controller@fee20000 {
 			msi-controller;
 			reg = <0x0 0xfee20000 0x0 0x20000>;
 		};
+
+		ppi-partitions {
+			ppi_cluster0: interrupt-partition-0 {
+				affinity = <&cpu_l0 &cpu_l1 &cpu_l2 &cpu_l3>;
+			};
+
+			ppi_cluster1: interrupt-partition-1 {
+				affinity = <&cpu_b0 &cpu_b1>;
+			};
+		};
 	};
 
 	saradc: saradc@ff100000 {