fdts: tc0: add support for cpu-idle-states

This includes both cpu and cluster sleep parameters.

Change-Id: I6a9e90b88508d6d2acd2538007cbbdd1cf976442
Signed-off-by: Usama Arif <usama.arif@arm.com>

fdts/tc0.dts

@@ -41,12 +41,38 @@
 			};
 		};
 
+		/*
+		 * The timings below are just to demonstrate working cpuidle.
+		 * These values may be inaccurate.
+		 */
+		idle-states {
+			entry-method = "arm,psci";
+
+			CPU_SLEEP_0: cpu-sleep-0 {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x0010000>;
+				local-timer-stop;
+				entry-latency-us = <300>;
+				exit-latency-us = <1200>;
+				min-residency-us = <2000>;
+			};
+			CLUSTER_SLEEP_0: cluster-sleep-0 {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x1010000>;
+				local-timer-stop;
+				entry-latency-us = <400>;
+				exit-latency-us = <1200>;
+				min-residency-us = <2500>;
+			};
+		};
+
 		CPU0:cpu@0 {
 			device_type = "cpu";
 			compatible = "arm,armv8";
 			reg = <0x0>;
 			enable-method = "psci";
 			clocks = <&scmi_dvfs 0>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 
 		CPU1:cpu@100 {
@@ -55,6 +81,7 @@
 			reg = <0x100>;
 			enable-method = "psci";
 			clocks = <&scmi_dvfs 0>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 
 		CPU2:cpu@200 {
@@ -63,6 +90,7 @@
 			reg = <0x200>;
 			enable-method = "psci";
 			clocks = <&scmi_dvfs 0>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 
 		CPU3:cpu@300 {
@@ -71,6 +99,7 @@
 			reg = <0x300>;
 			enable-method = "psci";
 			clocks = <&scmi_dvfs 0>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 
 	};