linux-kernel - [PATCH 7/7] Documentation: ABI: /sys/devices/system/cpu/cpu#/cpufreq/

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Message-ID: <20091022034546.13399.21222.stgit@bob.kio>
Date:	Wed, 21 Oct 2009 21:45:46 -0600
From:	Alex Chiang <achiang@...com>
To:	randy.dunlap@...cle.com, greg@...ah.com
Cc:	Dave Jones <davej@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, rientjes@...gle.com
Subject: [PATCH 7/7] Documentation: ABI: /sys/devices/system/cpu/cpu#/cpufreq/

This is a complex interface and is already described in
Documentation/cpu-freq/, especially in the user-guide.txt file.

No need to copy/paste all that information. Let's just alert the reader
to the presence of the user-guide.

Cc: Dave Jones <davej@...hat.com>
Signed-off-by: Alex Chiang <achiang@...com>
---

 Documentation/ABI/testing/sysfs-devices-system-cpu |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 968d8ba..81e61f5 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -121,6 +121,24 @@ Description:	Discover cpuidle policy and mechanism
 		See files in Documentation/cpuidle/ for more information.
 
 
+What:		/sys/devices/system/cpu/cpu#/cpufreq/*
+Date:		pre-git history
+Contact:	cpufreq@...r.kernel.org
+Description:	Discover and change clock speed of CPUs
+
+		Clock scaling allows you to change the clock speed of the
+		CPUs on the fly. This is a nice method to save battery
+		power, because the lower the clock speed, the less power
+		the CPU consumes.
+
+		There are many knobs to tweak in this directory.
+
+		See files in Documentation/cpu-freq/ for more information.
+
+		In particular, read Documentation/cpu-freq/user-guide.txt
+		to learn how to control the knobs.
+
+
 What:      /sys/devices/system/cpu/cpu*/cache/index*/cache_disable_X
 Date:      August 2008
 KernelVersion:	2.6.27

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