arm64: zynqmp: Add idle state for ZynqMP

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@aggios.com>
Acked-by: Will Wong <willw@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
index 4f7d9905e2354f1cc0dc44916d9e9a37f817e14d..8e6cf0cf3a69344efd9b9d4c264991a563c96bbd 100644 (file)
--- 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>;
+                       };
                };
        };