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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2014-07-09 17:45:12 +0200
committerJason Cooper <jason@lakedaemon.net>2014-07-16 12:54:13 +0000
commit3843607838cc5436d02a6771e661969a54c2fee0 (patch)
tree06ace83aaafc09ced693a1e9246e466d91005bda /arch/arm
parentd7f3ec2b69f692d215deb991d109a3341b0d8da9 (diff)
ARM: mvebu: update Armada XP DT for dynamic frequency scaling
In order to support dynamic frequency scaling: * the cpuclk Device Tree node needs to be updated to describe a second set of registers describing the PMU DFS registers. * the clock-latency property of the CPUs must be filled, otherwise the ondemand and conservative cpufreq governors refuse to work. The latency is high because the cost of a frequency transition is quite high on those CPUs. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Link: https://lkml.kernel.org/r/1404920715-19834-5-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/boot/dts/armada-xp-mv78230.dtsi2
-rw-r--r--arch/arm/boot/dts/armada-xp-mv78260.dtsi2
-rw-r--r--arch/arm/boot/dts/armada-xp-mv78460.dtsi4
-rw-r--r--arch/arm/boot/dts/armada-xp.dtsi2
4 files changed, 9 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/armada-xp-mv78230.dtsi b/arch/arm/boot/dts/armada-xp-mv78230.dtsi
index 1257ff1ed278..2592e1c13560 100644
--- a/arch/arm/boot/dts/armada-xp-mv78230.dtsi
+++ b/arch/arm/boot/dts/armada-xp-mv78230.dtsi
@@ -34,6 +34,7 @@
compatible = "marvell,sheeva-v7";
reg = <0>;
clocks = <&cpuclk 0>;
+ clock-latency = <1000000>;
};
cpu@1 {
@@ -41,6 +42,7 @@
compatible = "marvell,sheeva-v7";
reg = <1>;
clocks = <&cpuclk 1>;
+ clock-latency = <1000000>;
};
};
diff --git a/arch/arm/boot/dts/armada-xp-mv78260.dtsi b/arch/arm/boot/dts/armada-xp-mv78260.dtsi
index 3396b25b39e1..480e237a870f 100644
--- a/arch/arm/boot/dts/armada-xp-mv78260.dtsi
+++ b/arch/arm/boot/dts/armada-xp-mv78260.dtsi
@@ -36,6 +36,7 @@
compatible = "marvell,sheeva-v7";
reg = <0>;
clocks = <&cpuclk 0>;
+ clock-latency = <1000000>;
};
cpu@1 {
@@ -43,6 +44,7 @@
compatible = "marvell,sheeva-v7";
reg = <1>;
clocks = <&cpuclk 1>;
+ clock-latency = <1000000>;
};
};
diff --git a/arch/arm/boot/dts/armada-xp-mv78460.dtsi b/arch/arm/boot/dts/armada-xp-mv78460.dtsi
index 6da84bf40aaf..2c7b1fef4703 100644
--- a/arch/arm/boot/dts/armada-xp-mv78460.dtsi
+++ b/arch/arm/boot/dts/armada-xp-mv78460.dtsi
@@ -37,6 +37,7 @@
compatible = "marvell,sheeva-v7";
reg = <0>;
clocks = <&cpuclk 0>;
+ clock-latency = <1000000>;
};
cpu@1 {
@@ -44,6 +45,7 @@
compatible = "marvell,sheeva-v7";
reg = <1>;
clocks = <&cpuclk 1>;
+ clock-latency = <1000000>;
};
cpu@2 {
@@ -51,6 +53,7 @@
compatible = "marvell,sheeva-v7";
reg = <2>;
clocks = <&cpuclk 2>;
+ clock-latency = <1000000>;
};
cpu@3 {
@@ -58,6 +61,7 @@
compatible = "marvell,sheeva-v7";
reg = <3>;
clocks = <&cpuclk 3>;
+ clock-latency = <1000000>;
};
};
diff --git a/arch/arm/boot/dts/armada-xp.dtsi b/arch/arm/boot/dts/armada-xp.dtsi
index 5902e8359c91..bff9f6c18db1 100644
--- a/arch/arm/boot/dts/armada-xp.dtsi
+++ b/arch/arm/boot/dts/armada-xp.dtsi
@@ -99,7 +99,7 @@
cpuclk: clock-complex@18700 {
#clock-cells = <1>;
compatible = "marvell,armada-xp-cpu-clock";
- reg = <0x18700 0xA0>;
+ reg = <0x18700 0xA0>, <0x1c054 0x10>;
clocks = <&coreclk 1>;
};