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linux/Documentation/hwmon/lan966x.rst
Michael Walle c8f55be4a1 hwmon: add driver for the Microchip LAN966x SoC
Add support for the temperatur sensor and the fan controller on the
Microchip LAN966x SoC. Apparently, an Analog Bits PVT sensor is used
which can measure temperature and process voltages. But only a forumlae
for the temperature sensor is known. Additionally, the SoC support a fan
tacho input as well as a PWM signal to control the fan.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220401214032.3738095-5-michael@walle.cc
[groeck: Added missing reference in Documentation/hwmon/index.rst]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2022-05-22 11:32:30 -07:00

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.. SPDX-License-Identifier: GPL-2.0
Kernel driver lan966x-hwmon
===========================
Supported chips:
* Microchip LAN9668 (sensor in SoC)
Prefix: 'lan9668-hwmon'
Datasheet: https://microchip-ung.github.io/lan9668_reginfo
Authors:
Michael Walle <michael@walle.cc>
Description
-----------
This driver implements support for the Microchip LAN9668 on-chip
temperature sensor as well as its fan controller. It provides one
temperature sensor and one fan controller. The temperature range
of the sensor is specified from -40 to +125 degrees Celsius and
its accuracy is +/- 5 degrees Celsius. The fan controller has a
tacho input and a PWM output with a customizable PWM output
frequency ranging from ~20Hz to ~650kHz.
No alarms are supported by the SoC.
The driver exports temperature values, fan tacho input and PWM
settings via the following sysfs files:
**temp1_input**
**fan1_input**
**pwm1**
**pwm1_freq**