[PATCHv1 1/3] hwmon: Add support for GMT G762/G763 PWM fan controller

[Simon Guinot]

On Wed, Apr 24, 2013 at 03:47:31PM -0700, Guenter Roeck wrote:
> On Wed, Apr 24, 2013 at 10:28:47PM +0200, Arnaud Ebalard wrote:
> > Hi,
> > 
> > Guenter Roeck <linux at roeck-us.net> writes:
> > 
> > >> > You could consider using regmap for holding this cache.
> > >> >
> > >> > http://elceurope2012.sched.org/event/100619b669ce5767341624253aa03659?iframe=no&w=900&sidebar=yes&bg=no#.UXdspHLQ5jM
> > >> >
> > >> > http://elinux.org/ELCE_Europe_2012_Presentations
> > >> 
> > >> Interesting. As I am not yet familiar w/ regmap I would prefer having
> > >> the driver accepted during merge window with current data structure and
> > >> then convert it to regmap. But I will take a look (e.g. will study
> > >> fca1dd03 for instance). Thanks for the pointers. 
> > >> 
> > > I have not had time for a detailed review, but adding regmap support
> > > will not be a requirement.
> > >
> > > Note that it is too late for 3.10, so the driver will have to wait for
> > > 3.11.
> > 
> > Well, I think I can live with it; The only bad thing is that it kills my
> > excuses not to spend time on regmap ;-)
> > 
> Your call.
> 
> > 
> > >> >> +/*
> > >> >> + * Helpers to import hardware characteristics from .dts file and overload
> > >> >> + * default config values.
> > >> >> + */
> > >> >> +
> > >> >> +#ifdef CONFIG_OF
> > >> >
> > >> > Can the driver be used without device tree? Would it be simpler to
> > >> >  just add depends OF in the Kconfig entry?
> > >> 
> > >> It can be used if the default params (or those configured by u-boot I
> > >> guess) fit your needs. I think it would be fairly easy to extend the
> > >> driver later to expose g762_config struct to allow parameters to be set
> > >> w/o using OF. If someone wants to do that, I think it is better to not
> > >> depend on OF in Kconfig at the moment but I have not strong argument
> > >> other that that one. I'll let you decide.
> > >> 
> > > Agreed. As long as there are major platforms not supporting device tree,
> > > and as long as device tree overlays are not supported, it must not be made
> > > mandatory. Especially for I2C and SPI devices I reserve the right to be able
> > > test the hardware on an X86 system and not require a reboot to do so.
> > 
> > Understood. Following Simon's post, I think it's useful to implement
> > some init function for non DT-enabled platforms. 
> > 
> Sure, as long as Simon commits to test it and - if possible - to provide
> the necessary platform code.

Hi Guenter,

I commit to do whatever needed to have g762 support on the 2Big Network
v2 and 2Big NAS boards.

But note that I am can't test the options "pwm_enable" and "fan_target".
As we are using a two wire fan on this boards, this options are not
relevant.

Moreover except for the out_mode/pwm_mode setting, I am rather happy
with the default configuration.

Simon
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