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| author | Michael Walle <michael@walle.cc> | 2020-09-14 23:43:36 +0200 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2020-09-17 17:02:42 +0200 |
| commit | 3f697027bcb0959d7c24d59550ab1da07c2dd609 (patch) | |
| tree | ff0fa88f5151c0f03f14cb81bfc424a1ca905e4a /Documentation/hwmon | |
| parent | gpio: Add support for the sl28cpld GPIO controller (diff) | |
| download | linux-3f697027bcb0959d7c24d59550ab1da07c2dd609.tar.xz linux-3f697027bcb0959d7c24d59550ab1da07c2dd609.zip | |
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>
Diffstat (limited to 'Documentation/hwmon')
| -rw-r--r-- | Documentation/hwmon/index.rst | 1 | ||||
| -rw-r--r-- | Documentation/hwmon/sl28cpld.rst | 36 |
2 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 750d3a975d82..d90c43c82936 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -154,6 +154,7 @@ Hardware Monitoring Kernel Drivers sht3x shtc1 sis5595 + sl28cpld smm665 smsc47b397 smsc47m192 diff --git a/Documentation/hwmon/sl28cpld.rst b/Documentation/hwmon/sl28cpld.rst new file mode 100644 index 000000000000..7ed65f78250c --- /dev/null +++ b/Documentation/hwmon/sl28cpld.rst @@ -0,0 +1,36 @@ +.. 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. +======================= ======================================================== |