OrgRaspberrypi
/
linux
mirror of https://github.com/raspberrypi/linux.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

docs: hwmon: add emc2305.rst to docs 

Submitted to linux-hwmon mailing list at
https://patchwork.kernel.org/project/linux-hwmon/patch/20220430114905.53448-4-michaelsh@nvidia.com/

Add description of emc2305 driver.

Signed-off-by: Michael Shych <michaelsh@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
This commit is contained in:
Michael Shych 2022-04-30 14:49:05 +03:00 committed by Phil Elwell
parent 9ff4411c72
commit 1b7411e8c4
1 changed files with 40 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
Documentation/hwmon/emc2305.rst Normal file
View File

@ -0,0 +1,40 @@
.. SPDX-License-Identifier: GPL-2.0
Kernel driver emc2305
=====================
Supported chips:
Microchip EMC2305, EMC2303, EMC2302, EMC2301
Addresses scanned: I2C 0x27, 0x2c, 0x2d, 0x2e, 0x2f, 0x4c, 0x4d
Prefixes: 'emc2305'
Datasheet: Publicly available at the Microchip website :
https://www.microchip.com/en-us/product/EMC2305
Description:
-----------
This driver implements support for Microchip EMC2301/2/3/5 RPM-based PWM Fan Controller.
The EMC2305 Fan Controller supports up to 5 independently controlled PWM fan drives.
Fan rotation speeds are reported in RPM.
The driver supports the RPM-based PWM control to keep a fan at the desired speed.
The driver provides the possibility to have one common PWM interface for all FANs
or up to the maximum available or configured independent PWMs.
The driver provides the following sysfs interfaces in hwmon subsystem:
================= == ===================================================
fan[1-5]_fault RO files for tachometers TACH1-TACH5 fault indication
fan[1-5]_input RO files for tachometers TACH1-TACH5 input (in RPM)
pwm[1-5] RW file for fan[1-5] target duty cycle (0..255)
================= == ===================================================
sysfs interfaces in thermal subsystem:
================= == ========================================================================
cur_state RW file for the current cooling state of the cooling device (0..max_state)
max_state RO file for the maximum cooling state of the cooling device
================= == ========================================================================
Configuration is possible via device tree:
Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml