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3f697027bc
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>
37 lines
1.0 KiB
ReStructuredText
37 lines
1.0 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0-only
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Kernel driver sl28cpld
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======================
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Supported chips:
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* Kontron sl28cpld
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Prefix: 'sl28cpld'
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Datasheet: not available
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Authors: Michael Walle <michael@walle.cc>
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Description
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-----------
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The sl28cpld is a board management controller which also exposes a hardware
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monitoring controller. At the moment this controller supports a single fan
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supervisor. In the future there might be other flavours and additional
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hardware monitoring might be supported.
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The fan supervisor has a 7 bit counter register and a counter period of 1
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second. If the 7 bit counter overflows, the supervisor will automatically
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switch to x8 mode to support a wider input range at the loss of
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granularity.
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Sysfs entries
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-------------
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The following attributes are supported.
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======================= ========================================================
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fan1_input Fan RPM. Assuming 2 pulses per revolution.
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======================= ========================================================
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