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 e278708ee110187a4ba121613976c90917734e7d..04dda1a7c4d88c7da7232235205e51fd1c4e1cff 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>;
                };
 
                cpu@1 {
@@ -32,6 +33,7 @@
                        device_type = "cpu";
                        enable-method = "psci";
                        reg = <0x1>;
+                       cpu-idle-states = <&CPU_SLEEP_0>;
                };
 
                cpu@2 {
@@ -39,6 +41,7 @@
                        device_type = "cpu";
                        enable-method = "psci";
                        reg = <0x2>;
+                       cpu-idle-states = <&CPU_SLEEP_0>;
                };
 
                cpu@3 {
@@ -46,6 +49,20 @@
                        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>;
+                       };
                };
        };