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 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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