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authorViresh Kumar <viresh.kumar@linaro.org>2013-01-31 02:03:53 +0000
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-02-02 00:01:16 +0100
commit951fc5f45836988c7df1d05c7f4658f331e7a920 (patch)
tree196083ffadd033233faf66e0883c4662409ad569 /Documentation/cpu-freq/cpu-drivers.txt
parent5553f9e26f6f49a93ba732fd222eac6973a4cf35 (diff)
downloadlinux-951fc5f45836988c7df1d05c7f4658f331e7a920.tar.bz2
cpufreq: Update Documentation for cpus and related_cpus
Documentation related to cpus and related_cpus is confusing and not very clear. Over that CPUFreq core has seen much changes recently. Lets update documentation and comments for cpus and related_cpus. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/cpu-freq/cpu-drivers.txt')
-rw-r--r--Documentation/cpu-freq/cpu-drivers.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/cpu-freq/cpu-drivers.txt b/Documentation/cpu-freq/cpu-drivers.txt
index c436096351f8..72f70b16d299 100644
--- a/Documentation/cpu-freq/cpu-drivers.txt
+++ b/Documentation/cpu-freq/cpu-drivers.txt
@@ -111,6 +111,12 @@ policy->governor must contain the "default policy" for
For setting some of these values, the frequency table helpers might be
helpful. See the section 2 for more information on them.
+SMP systems normally have same clock source for a group of cpus. For these the
+.init() would be called only once for the first online cpu. Here the .init()
+routine must initialize policy->cpus with mask of all possible cpus (Online +
+Offline) that share the clock. Then the core would copy this mask onto
+policy->related_cpus and will reset policy->cpus to carry only online cpus.
+
1.3 verify
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