[PATCHv2 0/3] Add G762/G763 PWM fan controller

[Thierry Reding]

On Tue, May 28, 2013 at 12:15:04PM +0200, Arnaud Ebalard wrote:
> Hi Arnd,
> 
> Arnd Bergmann <arnd at arndb.de> writes:
> 
> > On Tuesday 28 May 2013 00:02:29 Arnaud Ebalard wrote:
> >> 
> >> This series adds support for GMT G762/G763. This work is based on a
> >> basic version for 2.6.31 kernel developed Olivier Mouchet for LaCie
> >> NAS. Updates have been performed to run on recent kernels. Support has
> >> been completed and additional features added: ability to configure
> >> various characteristics from .dts file, better initialization, alarms
> >> and error reporting support, gear mode, polarity, fan pulse per
> >> revolution, fan startup voltage control.
> >
> > I wonder if this could be split into two separate drivers, one for
> > the pwm subsystem, and one for a hardware-independent fan controller
> > based on the pwm interfaces.
> 
> To be honest, I wouldn't even know how to start in order to do that.
> Additionally, it would be worth the effort if other drivers could be
> easily refactored using this idea. I'll let hwmon people provide some
> feedback and try and comply with their directions (based on the cpu
> cycle I can spend on this).

What Arnd proposes doesn't sounds like a very good idea. PWM-controlled
fans should be able to work just fine using a generic driver that uses
the PWM framework, similar to the PWM backlight and LED drivers.

Thierry
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