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[07/26] cpu_cooling: Add comment to clarify relation between cooling state and frequency

Message ID 8a8a35afbdbc0e4408f494324e2d78195af0fdf7.1417167599.git.viresh.kumar@linaro.org (mailing list archive)
State Changes Requested
Delegated to: Eduardo Valentin
Headers show

Commit Message

Viresh Kumar Nov. 28, 2014, 9:44 a.m. UTC 
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>
---
 drivers/thermal/cpu_cooling.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
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Patch

diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index 3ef9050..def0f21 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -28,6 +28,20 @@ 
 #include <linux/cpu.h>
 #include <linux/cpu_cooling.h>
 
+/*
+ * Cooling state <-> CPUFreq frequency
+ *
+ * Cooling states are translated to frequencies throughout this driver and this
+ * is the relation between them.
+ *
+ * Highest cooling state corresponds to lowest possible frequency.
+ *
+ * i.e.
+ *	level 0 --> 1st Max Freq
+ *	level 1 --> 2nd Max Freq
+ *	...
+ */
+
 /**
  * struct cpufreq_cooling_device - data for cooling device with cpufreq
  * @id: unique integer value corresponding to each cpufreq_cooling_device