[PATCH v1] arm64: dts: cix: Add CPU idle states for Sky1

[Devin Li]

From: "devin.li" <Devin.Li at cixtech.com>

Add PSCI-based CPU idle state definitions for the Sky1 SoC,
enabling core and cluster level power management through
ARM PSCI firmware.

Three idle states are defined:

- CPU_SLEEP_0: Core idle state for A520 cores
  (psci-suspend-param 0x0010000), entry-latency 34us,
  exit-latency 100us

- CPU_SLEEP_1: Core idle state for A720 cores
  (psci-suspend-param 0x10000), entry-latency 31us,
  exit-latency 79us

- CLUSTER_SLEEP_0: Cluster idle state shared by all cores
  (psci-suspend-param 0x1010000), entry-latency 41us,
  exit-latency 104us

A520 cores (cpu0-3) reference CPU_SLEEP_0 and CLUSTER_SLEEP_0,
while A720 cores (cpu4-11) reference CPU_SLEEP_1 and
CLUSTER_SLEEP_0.

Signed-off-by: devin.li <Devin.Li at cixtech.com>
---
 arch/arm64/boot/dts/cix/sky1.dtsi | 41 +++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/arch/arm64/boot/dts/cix/sky1.dtsi b/arch/arm64/boot/dts/cix/sky1.dtsi
index bb5cfb1f2113..0611098b5f05 100644
--- a/arch/arm64/boot/dts/cix/sky1.dtsi
+++ b/arch/arm64/boot/dts/cix/sky1.dtsi
@@ -23,6 +23,7 @@ cpu0: cpu at 0 {
 			reg = <0x0 0x0>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <403>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu1: cpu at 100 {
@@ -31,6 +32,7 @@ cpu1: cpu at 100 {
 			reg = <0x0 0x100>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <403>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu2: cpu at 200 {
@@ -39,6 +41,7 @@ cpu2: cpu at 200 {
 			reg = <0x0 0x200>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <403>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu3: cpu at 300 {
@@ -47,6 +50,7 @@ cpu3: cpu at 300 {
 			reg = <0x0 0x300>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <403>;
+			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu4: cpu at 400 {
@@ -55,6 +59,7 @@ cpu4: cpu at 400 {
 			reg = <0x0 0x400>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <1024>;
+			cpu-idle-states = <&CPU_SLEEP_1 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu5: cpu at 500 {
@@ -63,6 +68,7 @@ cpu5: cpu at 500 {
 			reg = <0x0 0x500>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <1024>;
+			cpu-idle-states = <&CPU_SLEEP_1 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu6: cpu at 600 {
@@ -71,6 +77,7 @@ cpu6: cpu at 600 {
 			reg = <0x0 0x600>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <1024>;
+			cpu-idle-states = <&CPU_SLEEP_1 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu7: cpu at 700 {
@@ -79,6 +86,7 @@ cpu7: cpu at 700 {
 			reg = <0x0 0x700>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <1024>;
+			cpu-idle-states = <&CPU_SLEEP_1 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu8: cpu at 800 {
@@ -87,6 +95,7 @@ cpu8: cpu at 800 {
 			reg = <0x0 0x800>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <1024>;
+			cpu-idle-states = <&CPU_SLEEP_1 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu9: cpu at 900 {
@@ -95,6 +104,7 @@ cpu9: cpu at 900 {
 			reg = <0x0 0x900>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <1024>;
+			cpu-idle-states = <&CPU_SLEEP_1 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu10: cpu at a00 {
@@ -103,6 +113,7 @@ cpu10: cpu at a00 {
 			reg = <0x0 0xa00>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <1024>;
+			cpu-idle-states = <&CPU_SLEEP_1 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu11: cpu at b00 {
@@ -111,6 +122,7 @@ cpu11: cpu at b00 {
 			reg = <0x0 0xb00>;
 			device_type = "cpu";
 			capacity-dmips-mhz = <1024>;
+			cpu-idle-states = <&CPU_SLEEP_1 &CLUSTER_SLEEP_0>;
 		};
 
 		cpu-map {
@@ -153,6 +165,35 @@ core11 {
 				};
 			};
 		};
+
+		idle-states {
+			CPU_SLEEP_0: cpu-sleep-0 {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x0010000>;
+				local-timer-stop;
+				entry-latency-us = <34>;
+				exit-latency-us = <100>;
+				min-residency-us = <3000>;
+			};
+
+			CPU_SLEEP_1: cpu-sleep-1 {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x0010000>;
+				local-timer-stop;
+				entry-latency-us = <31>;
+				exit-latency-us = <79>;
+				min-residency-us = <3000>;
+			};
+
+			CLUSTER_SLEEP_0: cluster-sleep-0 {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x1010000>;
+				local-timer-stop;
+				entry-latency-us = <41>;
+				exit-latency-us = <104>;
+				min-residency-us = <4000>;
+			};
+		};
 	};
 
 	firmware {
-- 
2.49.0