arm64: dts: qcom: sm6375: Introduce C3 power state for both ARM clusters

Introduce the C3 power state, which - to the best of my understanding -
gates the CPU clock, but does not shut off the power rail.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230303-topic-sm6375_features0_dts-v2-13-708b8191f7eb@linaro.org

arch/arm64/boot/dts/qcom/sm6375.dtsi

@@ -214,6 +214,16 @@ core7 {
 		idle-states {
 			entry-method = "psci";
 
+			LITTLE_CPU_SLEEP_0: cpu-sleep-0-0 {
+				compatible = "arm,idle-state";
+				idle-state-name = "silver-power-collapse";
+				arm,psci-suspend-param = <0x40000003>;
+				entry-latency-us = <549>;
+				exit-latency-us = <901>;
+				min-residency-us = <1774>;
+				local-timer-stop;
+			};
+
 			LITTLE_CPU_SLEEP_1: cpu-sleep-0-1 {
 				compatible = "arm,idle-state";
 				idle-state-name = "silver-rail-power-collapse";
@@ -224,6 +234,16 @@ LITTLE_CPU_SLEEP_1: cpu-sleep-0-1 {
 				local-timer-stop;
 			};
 
+			BIG_CPU_SLEEP_0: cpu-sleep-1-0 {
+				compatible = "arm,idle-state";
+				idle-state-name = "gold-power-collapse";
+				arm,psci-suspend-param = <0x40000003>;
+				entry-latency-us = <523>;
+				exit-latency-us = <1244>;
+				min-residency-us = <2207>;
+				local-timer-stop;
+			};
+
 			BIG_CPU_SLEEP_1: cpu-sleep-1-1 {
 				compatible = "arm,idle-state";
 				idle-state-name = "gold-rail-power-collapse";
@@ -275,49 +295,49 @@ psci {
 		CPU_PD0: power-domain-cpu0 {
 			#power-domain-cells = <0>;
 			power-domains = <&CLUSTER_PD>;
-			domain-idle-states = <&LITTLE_CPU_SLEEP_1>;
+			domain-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>;
 		};
 
 		CPU_PD1: power-domain-cpu1 {
 			#power-domain-cells = <0>;
 			power-domains = <&CLUSTER_PD>;
-			domain-idle-states = <&LITTLE_CPU_SLEEP_1>;
+			domain-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>;
 		};
 
 		CPU_PD2: power-domain-cpu2 {
 			#power-domain-cells = <0>;
 			power-domains = <&CLUSTER_PD>;
-			domain-idle-states = <&LITTLE_CPU_SLEEP_1>;
+			domain-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>;
 		};
 
 		CPU_PD3: power-domain-cpu3 {
 			#power-domain-cells = <0>;
 			power-domains = <&CLUSTER_PD>;
-			domain-idle-states = <&LITTLE_CPU_SLEEP_1>;
+			domain-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>;
 		};
 
 		CPU_PD4: power-domain-cpu4 {
 			#power-domain-cells = <0>;
 			power-domains = <&CLUSTER_PD>;
-			domain-idle-states = <&LITTLE_CPU_SLEEP_1>;
+			domain-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>;
 		};
 
 		CPU_PD5: power-domain-cpu5 {
 			#power-domain-cells = <0>;
 			power-domains = <&CLUSTER_PD>;
-			domain-idle-states = <&LITTLE_CPU_SLEEP_1>;
+			domain-idle-states = <&LITTLE_CPU_SLEEP_0 &LITTLE_CPU_SLEEP_1>;
 		};
 
 		CPU_PD6: power-domain-cpu6 {
 			#power-domain-cells = <0>;
 			power-domains = <&CLUSTER_PD>;
-			domain-idle-states = <&BIG_CPU_SLEEP_1>;
+			domain-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>;
 		};
 
 		CPU_PD7: power-domain-cpu7 {
 			#power-domain-cells = <0>;
 			power-domains = <&CLUSTER_PD>;
-			domain-idle-states = <&BIG_CPU_SLEEP_1>;
+			domain-idle-states = <&BIG_CPU_SLEEP_0 &BIG_CPU_SLEEP_1>;
 		};
 
 		CLUSTER_PD: power-domain-cpu-cluster0 {