From 951fc5f45836988c7df1d05c7f4658f331e7a920 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 31 Jan 2013 02:03:53 +0000 Subject: 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 Signed-off-by: Rafael J. Wysocki --- Documentation/cpu-freq/cpu-drivers.txt | 6 ++++++ Documentation/cpu-freq/user-guide.txt | 8 ++++---- 2 files changed, 10 insertions(+), 4 deletions(-) (limited to 'Documentation') 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 ------------ diff --git a/Documentation/cpu-freq/user-guide.txt b/Documentation/cpu-freq/user-guide.txt index 04f6b32993e6..ff2f28332cc4 100644 --- a/Documentation/cpu-freq/user-guide.txt +++ b/Documentation/cpu-freq/user-guide.txt @@ -190,11 +190,11 @@ scaling_max_freq show the current "policy limits" (in first set scaling_max_freq, then scaling_min_freq. -affected_cpus : List of CPUs that require software coordination - of frequency. +affected_cpus : List of Online CPUs that require software + coordination of frequency. -related_cpus : List of CPUs that need some sort of frequency - coordination, whether software or hardware. +related_cpus : List of Online + Offline CPUs that need software + coordination of frequency. scaling_driver : Hardware driver for cpufreq. -- cgit v1.2.3