[PATCH] hwmon: (gpio-fan) allow to use alarm support alone from DT

[Simon Guinot]

On Mon, Feb 23, 2015 at 06:06:12AM -0800, Guenter Roeck wrote:
> On 02/23/2015 04:58 AM, Simon Guinot wrote:
> >On some boards, such as the LaCie 2Big Network v2 or 2Big NAS (based on
> >Marvell Kirkwood SoCs), an I2C fan controller is used but the alarm
> >signal is wired to a separate GPIO. Unfortunately, the gpio-fan driver
> >can't be used to handle GPIO alarm alone from DT: an error is returned
> >if the "gpios" DT property is missing.
> >
> >This patch allows to use the gpio-fan driver even if the "alarm-gpios"
> >DT property is defined alone.
> >
> 
> That is the wrong solution. The gpio alarm signal should be handled
> by the fan controller driver.

Hi Guenter,

Sure it should, but unfortunately it is not the case. I have several
boards using this mechanism (ie: a separate fan alarm GPIO). I think the
idea was to reduce the board cost...

Then this means I need a way to support this alarm signal and I can't
find a better one than using gpio-fan. Note that this was possible with
the original gpio-fan implementation (before the DT binding addition).

Let me know what you think.

Simon

> 
> Guenter
> 
> 
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