kernel

linux-6.8.1/Documentation/hwmon/max6620.rst

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+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+Kernel driver max6620
+=====================
+
+Supported chips:
+
+    Maxim MAX6620
+
+    Prefix: 'max6620'
+
+    Addresses scanned: none
+
+    Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6620.pdf
+
+Authors:
+    - L\. Grunenberg <contact@lgrunenberg.de>
+    - Cumulus Networks <support@cumulusnetworks.com>
+    - Shuotian Cheng <shuche@microsoft.com>
+    - Arun Saravanan Balachandran <Arun_Saravanan_Balac@dell.com>
+
+Description
+-----------
+
+This driver implements support for Maxim MAX6620 fan controller.
+
+The driver configures the fan controller in RPM mode. To give the readings more
+range or accuracy, the desired value can be set by a programmable register
+(1, 2, 4, 8, 16 or 32). Set higher values for larger speeds.
+
+The driver provides the following sensor access in sysfs:
+
+================ ======= =====================================================
+fan[1-4]_alarm   ro      Fan alarm.
+fan[1-4]_div     rw      Sets the nominal RPM range of the fan. Valid values
+                         are 1, 2, 4, 8, 16 and 32.
+fan[1-4]_input   ro      Fan speed in RPM.
+fan[1-4]_target  rw      Desired fan speed in RPM.
+================ ======= =====================================================
+
+Usage notes
+-----------
+
+This driver does not auto-detect devices. You will have to instantiate the
+devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
+details.