arm64: dts: lx2160a: add cpu idle support

lx2160a supports pw20 which could help save more power during cpu is
dile. It needs system firmware support via PSCI.
Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi

@@ -33,6 +33,7 @@ cpu@0 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster0_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@1 {
@@ -48,6 +49,7 @@ cpu@1 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster0_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@100 {
@@ -63,6 +65,7 @@ cpu@100 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster1_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@101 {
@@ -78,6 +81,7 @@ cpu@101 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster1_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@200 {
@@ -93,6 +97,7 @@ cpu@200 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster2_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@201 {
@@ -108,6 +113,7 @@ cpu@201 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster2_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@300 {
@@ -123,6 +129,7 @@ cpu@300 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster3_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@301 {
@@ -138,6 +145,7 @@ cpu@301 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster3_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@400 {
@@ -153,6 +161,7 @@ cpu@400 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster4_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@401 {
@@ -168,6 +177,7 @@ cpu@401 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster4_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@500 {
@@ -183,6 +193,7 @@ cpu@500 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster5_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@501 {
@@ -198,6 +209,7 @@ cpu@501 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster5_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@600 {
@@ -213,6 +225,7 @@ cpu@600 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster6_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@601 {
@@ -228,6 +241,7 @@ cpu@601 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster6_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@700 {
@@ -243,6 +257,7 @@ cpu@700 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster7_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cpu@701 {
@@ -258,6 +273,7 @@ cpu@701 {
 			i-cache-line-size = <64>;
 			i-cache-sets = <192>;
 			next-level-cache = <&cluster7_l2>;
+			cpu-idle-states = <&cpu_pw20>;
 		};
 
 		cluster0_l2: l2-cache0 {
@@ -323,6 +339,15 @@ cluster7_l2: l2-cache7 {
 			cache-sets = <1024>;
 			cache-level = <2>;
 		};
+
+		cpu_pw20: cpu-pw20 {
+			compatible = "arm,idle-state";
+			idle-state-name = "PW20";
+			arm,psci-suspend-param = <0x0>;
+			entry-latency-us = <2000>;
+			exit-latency-us = <2000>;
+			min-residency-us = <6000>;
+		  };
 	};
 
 	gic: interrupt-controller@6000000 {