1 .. SPDX-License-Identifier: GPL-2.0-or-later 1 .. SPDX-License-Identifier: GPL-2.0-or-later
2 2
3 Kernel driver max6620 3 Kernel driver max6620
4 ===================== 4 =====================
5 5
6 Supported chips: 6 Supported chips:
7 7
8 Maxim MAX6620 8 Maxim MAX6620
9 9
10 Prefix: 'max6620' 10 Prefix: 'max6620'
11 11
12 Addresses scanned: none 12 Addresses scanned: none
13 13
14 Datasheet: https://www.analog.com/media/en 14 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max6620.pdf
15 15
16 Authors: 16 Authors:
17 - L\. Grunenberg <contact@lgrunenberg.de> 17 - L\. Grunenberg <contact@lgrunenberg.de>
18 - Cumulus Networks <support@cumulusnetworks 18 - Cumulus Networks <support@cumulusnetworks.com>
19 - Shuotian Cheng <shuche@microsoft.com> 19 - Shuotian Cheng <shuche@microsoft.com>
20 - Arun Saravanan Balachandran <Arun_Saravan 20 - Arun Saravanan Balachandran <Arun_Saravanan_Balac@dell.com>
21 21
22 Description 22 Description
23 ----------- 23 -----------
24 24
25 This driver implements support for Maxim MAX66 25 This driver implements support for Maxim MAX6620 fan controller.
26 26
27 The driver configures the fan controller in RP 27 The driver configures the fan controller in RPM mode. To give the readings more
28 range or accuracy, the desired value can be se 28 range or accuracy, the desired value can be set by a programmable register
29 (1, 2, 4, 8, 16 or 32). Set higher values for 29 (1, 2, 4, 8, 16 or 32). Set higher values for larger speeds.
30 30
31 The driver provides the following sensor acces 31 The driver provides the following sensor access in sysfs:
32 32
33 ================ ======= ===================== 33 ================ ======= =====================================================
34 fan[1-4]_alarm ro Fan alarm. 34 fan[1-4]_alarm ro Fan alarm.
35 fan[1-4]_div rw Sets the nominal RPM 35 fan[1-4]_div rw Sets the nominal RPM range of the fan. Valid values
36 are 1, 2, 4, 8, 16 an 36 are 1, 2, 4, 8, 16 and 32.
37 fan[1-4]_input ro Fan speed in RPM. 37 fan[1-4]_input ro Fan speed in RPM.
38 fan[1-4]_target rw Desired fan speed in 38 fan[1-4]_target rw Desired fan speed in RPM.
39 ================ ======= ===================== 39 ================ ======= =====================================================
40 40
41 Usage notes 41 Usage notes
42 ----------- 42 -----------
43 43
44 This driver does not auto-detect devices. You 44 This driver does not auto-detect devices. You will have to instantiate the
45 devices explicitly. Please see Documentation/i 45 devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
46 details. 46 details.
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