[v6,5/5] arm: dts: qcom: Add idle states device nodes for 8974

Commit Message

Lina Iyer Sept. 23, 2014, 11:51 p.m. UTC

Add allowable C-States for each cpu using the cpu-idle-states node.
ARM spec dictates WFI as the default idle state at 0. Support standalone
power collapse (power down that does not affect any SoC idle states) for
each cpu.

Signed-off-by: Lina Iyer <[e-mail]>
---
 arch/arm/boot/dts/qcom-msm8974.dtsi | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

Patch

diff --git a/arch/arm/boot/dts/qcom-msm8974.dtsi b/arch/arm/boot/dts/qcom-msm8974.dtsi
index 0580bc2..e87b24f 100644
--- a/arch/arm/boot/dts/qcom-msm8974.dtsi
+++ b/arch/arm/boot/dts/qcom-msm8974.dtsi
@@ -21,6 +21,7 @@ 
 			reg = <0>;
 			next-level-cache = <&L2>;
 			qcom,acc = <&acc0>;
+			cpu-idle-states = <&CPU_WFI &CPU_SPC>;
 		};
 
 		CPU1: cpu@1 {
@@ -30,6 +31,7 @@ 
 			reg = <1>;
 			next-level-cache = <&L2>;
 			qcom,acc = <&acc1>;
+			cpu-idle-states = <&CPU_WFI &CPU_SPC>;
 		};
 
 		CPU2: cpu@2 {
@@ -39,6 +41,7 @@ 
 			reg = <2>;
 			next-level-cache = <&L2>;
 			qcom,acc = <&acc2>;
+			cpu-idle-states = <&CPU_WFI &CPU_SPC>;
 		};
 
 		CPU3: cpu@3 {
@@ -48,6 +51,7 @@ 
 			reg = <3>;
 			next-level-cache = <&L2>;
 			qcom,acc = <&acc3>;
+			cpu-idle-states = <&CPU_WFI &CPU_SPC>;
 		};
 
 		L2: l2-cache {
@@ -55,6 +59,22 @@ 
 			cache-level = <2>;
 			qcom,saw = <&saw_l2>;
 		};
+
+		idle-states {
+			CPU_WFI: wfi {
+				compatible = "qcom,idle-state-wfi", "arm,idle-state";
+				entry-latency-us = <1>;
+				exit-latency-us = <1>;
+				min-residency-us = <2>;
+			};
+
+			CPU_SPC: spc {
+				compatible = "qcom,idle-state-spc", "arm,idle-state";
+				entry-latency-us = <150>;
+				exit-latency-us = <200>;
+				min-residency-us = <2000>;
+			};
+		};
 	};
 
 	cpu-pmu {