Re: [PATCH 2/3] hwmon: Driver for OMAP3 temperature sensor

[Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>]

On Mon 2014-12-29 14:35:55, Nishanth Menon wrote:
> On 12/29/2014 12:15 PM, Pavel Machek wrote:
> > On Mon 2014-12-29 12:01:03, Nishanth Menon wrote:
> >> On Mon, Dec 29, 2014 at 11:52 AM, Grazvydas Ignotas <notasas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >>> On Fri, Dec 26, 2014 at 2:34 PM, Sebastian Reichel <sre-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> >>>> OMAP34xx and OMAP36xx processors contain a register in the syscon area,
> >>>> which can be used to determine the SoCs temperature. This patch provides
> >>>> a DT based driver for the temperature sensor based on an older driver
> >>>> written by Peter De Schrijver for the Nokia N900 and N9.
> >>>
> >>> The sensor looks like an earlier iteration of sensors used in newer
> >>> OMAPs, which are already supported by maybe
> >>> drivers/thermal/ti-soc-thermal/ , maybe it would make sense to update
> >>> that driver instead?
> >>
> >> Just to be clear - OMAP4 is the first time that the sensors were
> >> reliable enough to be used.
> > 
> > When testing initial version of the patch, they seem to work very well
> > in the omap3 case.
> 
> Just be careful when you try to make thermal policy like decisions
> based on this sensor. Placement of the sensor w.r.t the actual logic

I guess we won't do that, certainly not anytime soon.

> Also notice http://www.ti.com/lit/er/sprz278f/sprz278f.pdf "Advisory
> 3.1.1.186 MMC OCP Clock Not Gated When Thermal Sensor Is Used" I think
> there were accuracy issues at certain values etc.. So remember to do a
> off mode type PM tests as well before you consider requesting these to
> be merged.

Thanks a lot for a pointer. 3x 100uA power draw when you enable
temperature sensor, because it also errorneously enables MMC. I wonder
how the solution would look in the device tree...
									Pavel
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