Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
  [ACPI/CPUFREQ] Introduce bios_limit per cpu cpufreq sysfs interface
  [CPUFREQ] make internal cpufreq_add_dev_* static
  [CPUFREQ] use an enum for speedstep processor identification
  [CPUFREQ] Document units for transition latency
  [CPUFREQ] Use global sysfs cpufreq structure for conservative governor tunings
  [CPUFREQ] Documentation: ABI: /sys/devices/system/cpu/cpu#/cpufreq/
  [CPUFREQ] powernow-k6: set transition latency value so ondemand governor can be used
  [CPUFREQ] cpumask: don't put a cpumask on the stack in x86...cpufreq/powernow-k8.c

3 files changed, 32 insertions, 3 deletions

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index a703b9e9aeb9..974e29f5da86 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -136,6 +136,24 @@ 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@vger.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
diff --git a/Documentation/cpu-freq/cpu-drivers.txt b/Documentation/cpu-freq/cpu-drivers.txt
index 75a58d14d3cf..6c30e930c122 100644
--- a/Documentation/cpu-freq/cpu-drivers.txt
+++ b/Documentation/cpu-freq/cpu-drivers.txt
@@ -92,9 +92,9 @@ policy->cpuinfo.max_freq -	the minimum and maximum frequency
                                 (in kHz) which is supported by 
                                 this CPU
 policy->cpuinfo.transition_latency   the time it takes on this CPU to
-                                switch between two frequencies (if
-                                appropriate, else specify
-                                CPUFREQ_ETERNAL)
+                                switch between two frequencies in
+                                nanoseconds (if appropriate, else
+                                specify CPUFREQ_ETERNAL)
 
 policy->cur                     The current operating frequency of
                                 this CPU (if appropriate)
diff --git a/Documentation/cpu-freq/user-guide.txt b/Documentation/cpu-freq/user-guide.txt
index 2a5b850847c0..04f6b32993e6 100644
--- a/Documentation/cpu-freq/user-guide.txt
+++ b/Documentation/cpu-freq/user-guide.txt
@@ -203,6 +203,17 @@ scaling_cur_freq :		Current frequency of the CPU as determined by
                                 the frequency the kernel thinks the CPU runs
                                 at.
 
+bios_limit :                    If the BIOS tells the OS to limit a CPU to
+                                lower frequencies, the user can read out the
+                                maximum available frequency from this file.
+                                This typically can happen through (often not
+                                intended) BIOS settings, restrictions
+                                triggered through a service processor or other
+                                BIOS/HW based implementations.
+                                This does not cover thermal ACPI limitations
+                                which can be detected through the generic
+                                thermal driver.
+
 If you have selected the "userspace" governor which allows you to
 set the CPU operating frequency to a specific value, you can read out
 the current frequency in