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authorMichael Walle <michael@walle.cc>2022-04-02 00:40:32 +0300
committerGuenter Roeck <linux@roeck-us.net>2022-05-22 21:32:30 +0300
commitc8f55be4a1c7b4f64ecac1369e55f366b7f03bd2 (patch)
treed14d6eee5bd158056cef5b9a37784e0ef30e7e4e /Documentation/hwmon
parentede7e1c20b7533d89259027595fe4e0096b827c9 (diff)
downloadlinux-c8f55be4a1c7b4f64ecac1369e55f366b7f03bd2.tar.xz
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>
Diffstat (limited to 'Documentation/hwmon')
-rw-r--r--Documentation/hwmon/index.rst1
-rw-r--r--Documentation/hwmon/lan966x.rst40
2 files changed, 41 insertions, 0 deletions
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 355c682f9ec4..a72c16872ec2 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -90,6 +90,7 @@ Hardware Monitoring Kernel Drivers
jc42
k10temp
k8temp
+ lan966x
lineage-pem
lm25066
lm63
diff --git a/Documentation/hwmon/lan966x.rst b/Documentation/hwmon/lan966x.rst
new file mode 100644
index 000000000000..1d1724afa5d2
--- /dev/null
+++ b/Documentation/hwmon/lan966x.rst
@@ -0,0 +1,40 @@
+.. 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**