[PATCH v2 6/9] arm64: dts: qcom: msm8996: Add PSCI cpuidle low power states

[Amit Kucheria]

Add device bindings for cpuidle states for cpu devices.

msm8996 features 4 cpus - 2 in each cluster. However, all cpus implement
the same microarchitecture and the two clusters only differ in the
maximum frequency attainable by the CPUs.

Signed-off-by: Amit Kucheria <amit.kuche...@linaro.org>
---
 arch/arm64/boot/dts/qcom/msm8996.dtsi | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi 
b/arch/arm64/boot/dts/qcom/msm8996.dtsi
index c761269caf80..4f2fb7885f39 100644
--- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
@@ -95,6 +95,7 @@
                        compatible = "qcom,kryo";
                        reg = <0x0 0x0>;
                        enable-method = "psci";
+                       cpu-idle-states = <&CPU_SLEEP_0>;
                        next-level-cache = <&L2_0>;
                        L2_0: l2-cache {
                              compatible = "cache";
@@ -107,6 +108,7 @@
                        compatible = "qcom,kryo";
                        reg = <0x0 0x1>;
                        enable-method = "psci";
+                       cpu-idle-states = <&CPU_SLEEP_0>;
                        next-level-cache = <&L2_0>;
                };
 
@@ -115,6 +117,7 @@
                        compatible = "qcom,kryo";
                        reg = <0x0 0x100>;
                        enable-method = "psci";
+                       cpu-idle-states = <&CPU_SLEEP_0>;
                        next-level-cache = <&L2_1>;
                        L2_1: l2-cache {
                              compatible = "cache";
@@ -127,6 +130,7 @@
                        compatible = "qcom,kryo";
                        reg = <0x0 0x101>;
                        enable-method = "psci";
+                       cpu-idle-states = <&CPU_SLEEP_0>;
                        next-level-cache = <&L2_1>;
                };
 
@@ -151,6 +155,19 @@
                                };
                        };
                };
+
+               idle-states {
+                       entry-method = "psci";
+
+                       CPU_SLEEP_0: cpu-sleep-0 {
+                               compatible = "arm,idle-state";
+                               idle-state-name = "standalone-power-collapse";
+                               arm,psci-suspend-param = <0x00000004>;
+                               entry-latency-us = <40>;
+                               exit-latency-us = <80>;
+                               min-residency-us = <300>;
+                       };
+               };
        };
 
        thermal-zones {
-- 
2.17.1