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hwmon: (sch5627) Document behaviour of limit registers 

The values of the limit registers affect the fan speed in a
particular way. Document this behaviour so that future users
can exploit it if required.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20230907052639.16491-6-W_Armin@gmx.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Armin Wolf 2023-09-07 07:26:39 +02:00 committed by Guenter Roeck
parent 10655bb6df
commit e09b750526
1 changed files with 10 additions and 0 deletions
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Documentation/hwmon/sch5627.rst
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@ -33,3 +33,13 @@ The hardware monitoring part of the SMSC SCH5627 is accessed by talking
through an embedded microcontroller. An application note describing the
protocol for communicating with the microcontroller is available upon
request. Please mail me if you want a copy.
Controlling fan speed
---------------------
The SCH5627 allows for partially controlling the fan speed. If a temperature
channel excedes tempX_max, all fans are forced to maximum speed. The same is not
true for tempX_crit, presumably some other measures to cool down the system are
take in this case.
In which way the value of fanX_min affects the fan speed is currently unknown.