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/arm/dts/zynqmp.dtsi b/arch/arm/dts/zynqmp.dtsi
index de1f160..e2e76d7 100644
--- a/arch/arm/dts/zynqmp.dtsi
+++ b/arch/arm/dts/zynqmp.dtsi
@@ -22,6 +22,7 @@
device_type = "cpu";
enable-method = "psci";
reg = <0x0>;
+ cpu-idle-states = <&CPU_SLEEP_0>;
};
cpu@1 {
@@ -29,6 +30,7 @@
device_type = "cpu";
enable-method = "psci";
reg = <0x1>;
+ cpu-idle-states = <&CPU_SLEEP_0>;
};
cpu@2 {
@@ -36,6 +38,7 @@
device_type = "cpu";
enable-method = "psci";
reg = <0x2>;
+ cpu-idle-states = <&CPU_SLEEP_0>;
};
cpu@3 {
@@ -43,6 +46,20 @@
device_type = "cpu";
enable-method = "psci";
reg = <0x3>;
+ cpu-idle-states = <&CPU_SLEEP_0>;
+ };
+
+ idle-states {
+ entry-mehod = "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 = <800000>;
+ };
};
};