[PATCH v3 8/8] arm: dts: qcom: Add idle states device nodes for 8974

From: Lina Iyer <lina.iyer@linaro.org>
To: daniel.lezcano@linaro.org, khilman@linaro.org,
	sboyd@codeaurora.org, davidb@codeaurora.org,
	galak@codeaurora.org, linux-arm-msm@vger.kernel.org,
	lorenzo.pieralisi@arm.com
Cc: msivasub@codeauorora.org, Lina Iyer <lina.iyer@linaro.org>
Subject: [PATCH v3 8/8] arm: dts: qcom: Add idle states device nodes for 8974
Date: Mon, 18 Aug 2014 16:23:34 -0600	[thread overview]
Message-ID: <1408400614-45419-9-git-send-email-lina.iyer@linaro.org> (raw)
In-Reply-To: <1408400614-45419-1-git-send-email-lina.iyer@linaro.org>

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 <lina.iyer@linaro.org>
---
 arch/arm/boot/dts/qcom-msm8974.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/qcom-msm8974.dtsi b/arch/arm/boot/dts/qcom-msm8974.dtsi
index 0580bc2..fd66afb 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_SPC>;
 		};
 
 		CPU1: cpu@1 {
@@ -30,6 +31,7 @@
 			reg = <1>;
 			next-level-cache = <&L2>;
 			qcom,acc = <&acc1>;
+			cpu-idle-states = <&CPU_SPC>;
 		};
 
 		CPU2: cpu@2 {
@@ -39,6 +41,7 @@
 			reg = <2>;
 			next-level-cache = <&L2>;
 			qcom,acc = <&acc2>;
+			cpu-idle-states = <&CPU_SPC>;
 		};
 
 		CPU3: cpu@3 {
@@ -48,6 +51,7 @@
 			reg = <3>;
 			next-level-cache = <&L2>;
 			qcom,acc = <&acc3>;
+			cpu-idle-states = <&CPU_SPC>;
 		};
 
 		L2: l2-cache {
@@ -55,6 +59,16 @@
 			cache-level = <2>;
 			qcom,saw = <&saw_l2>;
 		};
+
+		idle-states {
+			CPU_SPC: cpu-sleep-0 {
+				compatible = "arm,idle-state";
+				entry-latency-us = <150>;
+				exit-latency-us = <200>;
+				min-residency-us = <2000>;
+				entry-method = "standalone-pc";
+			};
+		};
 	};
 
 	cpu-pmu {
-- 
1.9.1
