linux-stable/Documentation/hwmon/sl28cpld.rst
Michael Walle 3f697027bc hwmon: Add support for the sl28cpld hardware monitoring controller
Add support for the hardware monitoring controller of the sl28cpld board
management controller. This driver is part of a multi-function device.

Signed-off-by: Michael Walle <michael@walle.cc>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2020-09-17 16:02:42 +01:00

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.. SPDX-License-Identifier: GPL-2.0-only
Kernel driver sl28cpld
======================
Supported chips:
* Kontron sl28cpld
Prefix: 'sl28cpld'
Datasheet: not available
Authors: Michael Walle <michael@walle.cc>
Description
-----------
The sl28cpld is a board management controller which also exposes a hardware
monitoring controller. At the moment this controller supports a single fan
supervisor. In the future there might be other flavours and additional
hardware monitoring might be supported.
The fan supervisor has a 7 bit counter register and a counter period of 1
second. If the 7 bit counter overflows, the supervisor will automatically
switch to x8 mode to support a wider input range at the loss of
granularity.
Sysfs entries
-------------
The following attributes are supported.
======================= ========================================================
fan1_input Fan RPM. Assuming 2 pulses per revolution.
======================= ========================================================