Documentation: add ABI entry for intel_pstate

Add a Documentation/ABI entry for
/sys/devices/system/cpu/intel_pstate/max_perf_pct,
/sys/devices/system/cpu/intel_pstate/min_perf_pct, and
/sys/devices/system/cpu/intel_pstate/no_turbo.

Cc: Dirk Brandewie <dirk.brandewie@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 468e4d4..d5a0d33 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -200,3 +200,27 @@ Description:       address and size of the percpu note.
                note of cpu#.
 
                crash_notes_size: size of the note of cpu#.
+
+
+What:          /sys/devices/system/cpu/intel_pstate/max_perf_pct
+               /sys/devices/system/cpu/intel_pstate/min_perf_pct
+               /sys/devices/system/cpu/intel_pstate/no_turbo
+Date:          February 2013
+Contact:       linux-pm@vger.kernel.org
+Description:   Parameters for the Intel P-state driver
+
+               Logic for selecting the current P-state in Intel
+               Sandybridge+ processors. The three knobs control
+               limits for the P-state that will be requested by the
+               driver.
+
+               max_perf_pct: limits the maximum P state that will be requested by
+               the driver stated as a percentage of the available performance.
+
+               min_perf_pct: limits the minimum P state that will be requested by
+               the driver stated as a percentage of the available performance.
+
+               no_turbo: limits the driver to selecting P states below the turbo
+               frequency range.
+
+               More details can be found in Documentation/cpu-freq/intel-pstate.txt