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hwmon: Add tc654 driver

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Add support for the tc654 and tc655 fan controllers from Microchip.

http://ww1.microchip.com/downloads/en/DeviceDoc/20001734C.pdf

Signed-off-by: Chris Packham <[email protected]>
Acked-by: Rob Herring <[email protected]>
[groeck: Fixed continuation line alignments]
Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
Chris Packham 2016-10-11 10:26:31 +13:00 • committed by Guenter Roeck
commit aaf6fabf1b
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Kernel driver tc654
===================
Supported chips:
* Microship TC654 and TC655
Prefix: 'tc654'
Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/20001734C.pdf
Authors:
Chris Packham <[email protected]>
Masahiko Iwamoto <[email protected]>
Description
-----------
This driver implements support for the Microchip TC654 and TC655.
The TC654 uses the 2-wire interface compatible with the SMBUS 2.0
specification. The TC654 has two (2) inputs for measuring fan RPM and
one (1) PWM output which can be used for fan control.
Configuration Notes
-------------------
Ordinarily the pwm1_mode ABI is used for controlling the pwm output
mode. However, for this chip the output is always pwm, and the
pwm1_mode determines if the pwm output is controlled via the pwm1 value
or via the Vin analog input.
Setting pwm1_mode to 1 will cause the pwm output to be driven based on
the pwm1 value. Setting pwm1_mode to 0 will cause the pwm output to be
driven based on the Vin input.