linux-kernel - [PATCH v2 5/5] hwmon: (sch5627) Document behaviour of limit registers

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Message-Id: <20230907052639.16491-6-W_Armin@gmx.de>
Date:   Thu,  7 Sep 2023 07:26:39 +0200
From:   Armin Wolf <W_Armin@....de>
To:     hdegoede@...hat.com
Cc:     jdelvare@...e.com, linux@...ck-us.net, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/5] 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@....de>
---
 Documentation/hwmon/sch5627.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/hwmon/sch5627.rst b/Documentation/hwmon/sch5627.rst
index ecb4fc84d045..8639dff234fc 100644
--- a/Documentation/hwmon/sch5627.rst
+++ b/Documentation/hwmon/sch5627.rst
@@ -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.
--
2.39.2