Re: [PATCH v2 1/5] thermal: change "hysteresis" as optional property

[Leo Yan]

Hi Eduardo,

On Fri, Mar 04, 2016 at 11:57:53AM +0000, Javi Merino wrote:
> On Fri, Mar 04, 2016 at 11:03:49AM +0800, Leo Yan wrote:
> > On Thu, Mar 03, 2016 at 08:29:44AM -0800, Eduardo Valentin wrote:
> > > On Fri, Feb 26, 2016 at 11:43:43AM +0800, Leo Yan wrote:

[...]

> > > > The property "hysteresis" is mandatory for trip points, so if without
> > > > it the thermal zone cannot register successfully. But "hysteresis" is
> > > > ignored in the thermal subsystem and only inquired by several thermal
> > > > sensor drivers.
> > > 
> > > If the Linux thermal subsystem has a problem with handling hysteresis, I
> > > would rather fix Linux code than relaxing the DT binding. Or if you
> > > still believe hysteresis is really optional, I would prefer to see a
> > > better justification than "Linux ignores it".
> 
> I see it the other way round, Is hysteresis a property that, without
> it, the thermal code can't configure itself so it fails to create the
> trip point?  The current code goes "There is no hysteresis for this
> property, I don't know how to set up this trip point!".  I think we
> can do better than this.

Do you agree with Javi's suggestion? If you think it's okay, I will
move on to send out a new version patch based on Javi's comments.

Thanks,
Leo Yan