Merge branch 'omap-clock-fixes' of git://git.pwsan.com/linux-2.6

[linux-2.6-omap-h63xx.git] / Documentation / cpu-freq / user-guide.txt

diff --git a/Documentation/cpu-freq/user-guide.txt b/Documentation/cpu-freq/user-guide.txt
index 917918f84fc75ac09061be1f1f242159823983cf..75f41193f3e1858b2370a2f4500caf49d2b90360 100644 (file)
--- a/Documentation/cpu-freq/user-guide.txt
+++ b/Documentation/cpu-freq/user-guide.txt
@@ -152,6 +152,18 @@ cpuinfo_min_freq :         this file shows the minimum operating
                                frequency the processor can run at(in kHz) 
 cpuinfo_max_freq :             this file shows the maximum operating
                                frequency the processor can run at(in kHz) 
+cpuinfo_transition_latency     The time it takes on this CPU to
+                               switch between two frequencies in nano
+                               seconds. If unknown or known to be
+                               that high that the driver does not
+                               work with the ondemand governor, -1
+                               (CPUFREQ_ETERNAL) will be returned.
+                               Using this information can be useful
+                               to choose an appropriate polling
+                               frequency for a kernel governor or
+                               userspace daemon. Make sure to not
+                               switch the frequency too often
+                               resulting in performance loss.
 scaling_driver :               this file shows what cpufreq driver is
                                used to set the frequency on this CPU