linux-kernel - [PATCH 02/10] arm64: zynqmp: Add idle state for ZynqMP

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Date:   Thu, 20 Jul 2017 14:17:01 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Stefan Krsmanovic <stefan.krsmanovic@...ios.com>,
        Sören Brinkmann <soren.brinkmann@...inx.com>,
        Punnaiah Choudary Kalluri 
        <punnaiah.choudary.kalluri@...inx.com>, monstr@...str.eu,
        "Edgar E. Iglesias" <edgar.iglesias@...inx.com>,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marc Zyngier <marc.zyngier@....com>,
        Dinh Nguyen <dinguyen@...nsource.altera.com>,
        Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>,
        Moritz Fischer <mdf@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH 02/10] arm64: zynqmp: Add idle state for ZynqMP

From: Stefan Krsmanovic <stefan.krsmanovic@...ios.com>

Added the idle-states node to describe zynqmp idle states. Only
cpu-sleep-0 idle state is added in this patch. References to the
idle-states node are added in all CPU nodes. Time values: entry/exit
latencies and min-residency, needs to be tuned. arm,psci-suspend-param
is selected to comply with PSCIv1.0 and Extended StateID format.

Signed-off-by: Stefan Krsmanovic <stefan.krsmanovic@...ios.com>
Acked-by: Will Wong <willw@...inx.com>
Signed-off-by: Michal Simek <michal.simek@...inx.com>
---

 arch/arm64/boot/dts/xilinx/zynqmp.dtsi | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
index 4f7d9905e235..8e6cf0cf3a69 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
+++ b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
@@ -25,6 +25,7 @@
 			device_type = "cpu";
 			enable-method = "psci";
 			reg = <0x0>;
+			cpu-idle-states = <&CPU_SLEEP_0>;
 		};
 
 		cpu1: cpu@1 {
@@ -32,6 +33,7 @@
 			device_type = "cpu";
 			enable-method = "psci";
 			reg = <0x1>;
+			cpu-idle-states = <&CPU_SLEEP_0>;
 		};
 
 		cpu2: cpu@2 {
@@ -39,6 +41,7 @@
 			device_type = "cpu";
 			enable-method = "psci";
 			reg = <0x2>;
+			cpu-idle-states = <&CPU_SLEEP_0>;
 		};
 
 		cpu3: cpu@3 {
@@ -46,6 +49,20 @@
 			device_type = "cpu";
 			enable-method = "psci";
 			reg = <0x3>;
+			cpu-idle-states = <&CPU_SLEEP_0>;
+		};
+
+		idle-states {
+			entry-method = "arm,psci";
+
+			CPU_SLEEP_0: cpu-sleep-0 {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x40000000>;
+				local-timer-stop;
+				entry-latency-us = <300>;
+				exit-latency-us = <600>;
+				min-residency-us = <10000>;
+			};
 		};
 	};
 
-- 
1.9.1