From: thomas.petazzoni@free-electrons.com (Thomas Petazzoni)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCHv3 4/7] ARM: mvebu: update Armada XP DT for dynamic frequency scaling
Date: Wed, 9 Jul 2014 17:45:12 +0200 [thread overview]
Message-ID: <1404920715-19834-5-git-send-email-thomas.petazzoni@free-electrons.com> (raw)
In-Reply-To: <1404920715-19834-1-git-send-email-thomas.petazzoni@free-electrons.com>
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>
---
arch/arm/boot/dts/armada-xp-mv78230.dtsi | 2 ++
arch/arm/boot/dts/armada-xp-mv78260.dtsi | 2 ++
arch/arm/boot/dts/armada-xp-mv78460.dtsi | 4 ++++
arch/arm/boot/dts/armada-xp.dtsi | 2 +-
4 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/armada-xp-mv78230.dtsi b/arch/arm/boot/dts/armada-xp-mv78230.dtsi
index 1257ff1..2592e1c 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 at 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 3396b25..480e237 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 at 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 6da84bf..2c7b1fe 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 at 1 {
@@ -44,6 +45,7 @@
compatible = "marvell,sheeva-v7";
reg = <1>;
clocks = <&cpuclk 1>;
+ clock-latency = <1000000>;
};
cpu at 2 {
@@ -51,6 +53,7 @@
compatible = "marvell,sheeva-v7";
reg = <2>;
clocks = <&cpuclk 2>;
+ clock-latency = <1000000>;
};
cpu at 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 5902e83..bff9f6c 100644
--- a/arch/arm/boot/dts/armada-xp.dtsi
+++ b/arch/arm/boot/dts/armada-xp.dtsi
@@ -99,7 +99,7 @@
cpuclk: clock-complex at 18700 {
#clock-cells = <1>;
compatible = "marvell,armada-xp-cpu-clock";
- reg = <0x18700 0xA0>;
+ reg = <0x18700 0xA0>, <0x1c054 0x10>;
clocks = <&coreclk 1>;
};
--
2.0.0
next prev parent reply other threads:[~2014-07-09 15:45 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-09 15:45 [PATCHv3 0/7] cpufreq support for Marvell Armada XP Thomas Petazzoni
2014-07-09 15:45 ` [PATCHv3 1/7] ARM: mvebu: ensure CPU clocks are enabled Thomas Petazzoni
2014-07-16 13:02 ` Jason Cooper
2014-07-09 15:45 ` [PATCHv3 2/7] ARM: mvebu: extend PMSU code to support dynamic frequency scaling Thomas Petazzoni
2014-07-23 23:50 ` Mike Turquette
2014-07-24 6:29 ` Thomas Petazzoni
2014-07-24 11:11 ` Jason Cooper
2014-07-09 15:45 ` [PATCHv3 3/7] clk: mvebu: extend clk-cpu for " Thomas Petazzoni
2014-07-09 15:45 ` Thomas Petazzoni [this message]
2014-07-16 12:55 ` [PATCHv3 4/7] ARM: mvebu: update Armada XP DT " Jason Cooper
2014-07-09 15:45 ` [PATCHv3 5/7] ARM: mvebu: allow enabling of cpufreq on Armada XP Thomas Petazzoni
2014-07-09 15:45 ` [PATCHv3 6/7] ARM: mvebu: update mvebu_v7_defconfig with cpufreq support Thomas Petazzoni
2014-07-16 12:52 ` Jason Cooper
2014-07-09 15:45 ` [PATCHv3 7/7] ARM: configs: add cpufreq-generic in multi_v7_defconfig Thomas Petazzoni
2014-07-16 12:49 ` Jason Cooper
2014-07-13 22:33 ` [PATCHv3 0/7] cpufreq support for Marvell Armada XP Jason Cooper
2014-07-23 11:19 ` Thomas Petazzoni
2014-07-23 11:39 ` Jason Cooper
2014-07-23 11:53 ` Thomas Petazzoni
2014-07-23 16:52 ` Viresh Kumar
2014-07-23 23:53 ` [PATCHv3 3/7] clk: mvebu: extend clk-cpu for dynamic frequency scaling Thomas Petazzoni
2014-07-24 6:33 ` Thomas Petazzoni
2014-07-24 17:52 ` Mike Turquette
2014-07-24 18:24 ` Thomas Petazzoni
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