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PM / OPP: Move cpufreq specific OPP functions out of generic OPP library

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CPUFreq specific helper functions for OPP (Operating Performance Points)
now use generic OPP functions that allow CPUFreq to be be moved back
into CPUFreq framework. This allows for independent modifications
or future enhancements as needed isolated to just CPUFreq framework
alone.

Here, we just move relevant code and documentation to make this part of
CPUFreq infrastructure.

Cc: Kevin Hilman <[email protected]>
Signed-off-by: Nishanth Menon <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Nishanth Menon 2014-05-05 08:33:50 -05:00 • committed by Rafael J. Wysocki
commit a0dd7b7965
7 changed files with 167 additions and 147 deletions
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29
Documentation/cpu-freq/core.txt
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@ -20,6 +20,7 @@ Contents:
---------
1. CPUFreq core and interfaces
2. CPUFreq notifiers
3. CPUFreq Table Generation with Operating Performance Point (OPP)
1. General Information
=======================
@ -92,3 +93,31 @@ values:
cpu - number of the affected CPU
old - old frequency
new - new frequency
3. CPUFreq Table Generation with Operating Performance Point (OPP)
==================================================================
For details about OPP, see Documentation/power/opp.txt
dev_pm_opp_init_cpufreq_table - cpufreq framework typically is initialized with
cpufreq_frequency_table_cpuinfo which is provided with the list of
frequencies that are available for operation. This function provides
a ready to use conversion routine to translate the OPP layer's internal
information about the available frequencies into a format readily
providable to cpufreq.
WARNING: Do not use this function in interrupt context.
Example:
soc_pm_init()
{
/* Do things */
r = dev_pm_opp_init_cpufreq_table(dev, &freq_table);
if (!r)
cpufreq_frequency_table_cpuinfo(policy, freq_table);
/* Do other things */
}
NOTE: This function is available only if CONFIG_CPU_FREQ is enabled in
addition to CONFIG_PM_OPP.
dev_pm_opp_free_cpufreq_table - Free up the table allocated by dev_pm_opp_init_cpufreq_table