diff options
| author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2014-07-09 17:45:12 +0200 |
|---|---|---|
| committer | Jason Cooper <jason@lakedaemon.net> | 2014-07-16 12:54:13 +0000 |
| commit | 3843607838cc5436d02a6771e661969a54c2fee0 (patch) | |
| tree | 06ace83aaafc09ced693a1e9246e466d91005bda | |
| parent | d7f3ec2b69f692d215deb991d109a3341b0d8da9 (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>
| -rw-r--r-- | arch/arm/boot/dts/armada-xp-mv78230.dtsi | 2 | ||||
| -rw-r--r-- | arch/arm/boot/dts/armada-xp-mv78260.dtsi | 2 | ||||
| -rw-r--r-- | arch/arm/boot/dts/armada-xp-mv78460.dtsi | 4 | ||||
| -rw-r--r-- | arch/arm/boot/dts/armada-xp.dtsi | 2 |
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>; }; |