arm64: dts: Add L2 cache topology to Hi6220

This patch adds the L2 cache topology on Hi6220. Hi6220 has two
clusters, every cluster has 512KiB L2 cache (32KiB x 16 ways).
Signed-off-by: NLeo Yan <leo.yan@linaro.org>
Signed-off-by: NWei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hi6220.dtsi

@@ -83,6 +83,7 @@
 			device_type = "cpu";
 			reg = <0x0 0x0>;
 			enable-method = "psci";
+			next-level-cache = <&CLUSTER0_L2>;
 			clocks = <&stub_clock 0>;
 			operating-points-v2 = <&cpu_opp_table>;
 			cooling-min-level = <4>;
@@ -97,6 +98,7 @@
 			device_type = "cpu";
 			reg = <0x0 0x1>;
 			enable-method = "psci";
+			next-level-cache = <&CLUSTER0_L2>;
 			operating-points-v2 = <&cpu_opp_table>;
 			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
 		};
@@ -106,6 +108,7 @@
 			device_type = "cpu";
 			reg = <0x0 0x2>;
 			enable-method = "psci";
+			next-level-cache = <&CLUSTER0_L2>;
 			operating-points-v2 = <&cpu_opp_table>;
 			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
 		};
@@ -115,6 +118,7 @@
 			device_type = "cpu";
 			reg = <0x0 0x3>;
 			enable-method = "psci";
+			next-level-cache = <&CLUSTER0_L2>;
 			operating-points-v2 = <&cpu_opp_table>;
 			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
 		};
@@ -124,6 +128,7 @@
 			device_type = "cpu";
 			reg = <0x0 0x100>;
 			enable-method = "psci";
+			next-level-cache = <&CLUSTER1_L2>;
 			operating-points-v2 = <&cpu_opp_table>;
 			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
 		};
@@ -133,6 +138,7 @@
 			device_type = "cpu";
 			reg = <0x0 0x101>;
 			enable-method = "psci";
+			next-level-cache = <&CLUSTER1_L2>;
 			operating-points-v2 = <&cpu_opp_table>;
 			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
 		};
@@ -142,6 +148,7 @@
 			device_type = "cpu";
 			reg = <0x0 0x102>;
 			enable-method = "psci";
+			next-level-cache = <&CLUSTER1_L2>;
 			operating-points-v2 = <&cpu_opp_table>;
 			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
 		};
@@ -151,9 +158,18 @@
 			device_type = "cpu";
 			reg = <0x0 0x103>;
 			enable-method = "psci";
+			next-level-cache = <&CLUSTER1_L2>;
 			operating-points-v2 = <&cpu_opp_table>;
 			cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
 		};
+
+		CLUSTER0_L2: l2-cache0 {
+			compatible = "cache";
+		};
+
+		CLUSTER1_L2: l2-cache1 {
+			compatible = "cache";
+		};
 	};
 
 	cpu_opp_table: cpu_opp_table {