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thermal: cpu_cooling: Add comment to clarify relation between cooling state and frequency
This wasn't explained well anywhere and should be clearly specified. Lets add a top level comment for this. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
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@ -28,6 +28,20 @@
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#include <linux/cpu.h>
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#include <linux/cpu_cooling.h>
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/*
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* Cooling state <-> CPUFreq frequency
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*
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* Cooling states are translated to frequencies throughout this driver and this
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* is the relation between them.
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*
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* Highest cooling state corresponds to lowest possible frequency.
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*
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* i.e.
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* level 0 --> 1st Max Freq
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* level 1 --> 2nd Max Freq
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* ...
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*/
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/**
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* struct cpufreq_cooling_device - data for cooling device with cpufreq
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* @id: unique integer value corresponding to each cpufreq_cooling_device
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