Re: [PATCH v4 2/4] dt-bindings: document Rockchip thermal

Zhang Rui
2014-09-16T07:24:38Z

On Thu, 2014-09-11 at 11:53 -0400, Eduardo Valentin wrote:
> Arnd,
>
> On Thu, Sep 11, 2014 at 02:32:08PM +0200, Arnd Bergmann wrote:
> > On Thursday 11 September 2014 08:18:43 Eduardo Valentin wrote:
> > > > As what we want is to make thermal driver have a chance to configure the
> > > > hardware shutdown registers, I'm thinking if we can do this without
> > > > representing the hardware shutdown value as a trip point.
> > > > Say,
> > > > 1. parse DT, and get the hardware shutdown temperature value, and store
> > > > it somewhere, e.g. struct __thermal_zone.
> > > > 2. introduce a new parameter, int (*set_hardware_trip)(void *, long *),
> > > > in thermal_zone_of_sensor_register().
> > > > 3. invoke set_hard_trip(tz, hardware_shutdown_temperature_value) in
> > > > thermal_zone_of_sensor_register().
> > >
> > > The only issue I have with the above proposal is that not all platforms
> > > use DT. Some still boot with boardfiles, for instance. Thus, the
> > > parameter to configure hardware thermal shutdown needs to be common on
> > > thermal core, not specific to of-thermal. Do you agree?
> >
> > Do you know of a machine that can't yet be converted to DT and that
> > needs this driver? In case of rockchips that is certainly not the
> > case, and we don't care about anybody trying to use board files out
> > of tree, they can just hack the thermal support as well.
>
> I see. Again, the only concern I have is to produce thermal framework APIs
> that would be only in the of-thermal. My point is not specific to this
> patch, or this platform, but with a detail in the above proposal.
>
> While I agree to have a trip specific to configurable hardware triggered
> thermal shutdown, I just don't see why it needs to be a feature
> implemented only via of-thermal. It has to be properly defined in
> thermal core.
>
> The proposal of of-thermal is not to become a separate/competing thermal
> framework.
>
Agreed.
And I think we can have such feature in thermal core.
But again I don't think we should represent it as an trip point.

thanks,
rui
> >
> > Arnd
>
> Cheers,
>
> Eduardo