Re: [RFC 2/2] hwmon: lm90: add thermal_zone temperature sensor support

[Christian Lamparter <chunkeey@googlemail.com>]

On Sunday, February 5, 2017 7:10:53 PM CET Guenter Roeck wrote:
> On 02/05/2017 01:03 PM, Christian Lamparter wrote:
> > This patch adds thermal_zone temperature sensor support
> > to the lm90 module. The feature has to be enabled
> > separately via the Kconfig option:
> > 	CONFIG_SENSORS_LM90_THERMAL_DEVICE
> >
> > The LM90 supports two (three for MAX6695 and MAX6696)
> > temperature sensors. The local sensor is integrated
> > into the LM90 chip. The remote sensors are connected
> > to external temperature sensing diodes.
> >
> > Cc: Wei Ni <wni@nvidia.com>
> > Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
> 
> Since the hwnmon core now supports thermal registration, and since the lm90
> driver has already been converted to using the new hwmon API, I would
> rather like to understand why using the hwmon core for this purpose is
> insufficient, and I would prefer to address the deficiencies in the hwmon
> core and not in the driver.

Hey, that's great, I completely missed that! Yes, this makes the changes
to lm90.c obsolete.

However, what about the device-tree updates in 1/2? I'm asking because
the hwmon device node still needs the #thermal-sensor-cells property
defined for thermal_zone_of_sensor_register(). Without it, the sensor
will be skipped and the thermal-zones will do nothing (no regulation).
I can respin the device-tree patch (local and remote need to trade 
places). What do you think?

Regards,
Christian

[0] <http://lxr.free-electrons.com/source/drivers/thermal/of-thermal.c#L495>