On 20/08/14 23:25, Stephen Warren wrote:

On 08/13/2014 06:41 AM, Mikko Perttunen wrote:

quoted

This adds a device tree controlled option to enable PMC-based
thermal reset in overheating situations. Thermtrip is supported on
Tegra30, Tegra114 and Tegra124. The thermal reset only works when
the thermal sensors are calibrated, so a soctherm driver is also
required.

If calibration is required, presumably the soctherm must initialize
before this thermtrip code can initialize, or this thermtrip logic might
be triggered by uncalibrated sensors?

SOCTHERM requires that each sensor be explicitly enabled before it gives 
readings. If a sensor is not enabled, the temperature given by the 
register (and used to trigger thermtrip) will be zero. So in order for a 
thermtrip shutdown to be caused before soctherm is initialized, the 
thermtrip temperature would have to be programmed to below zero (the 
default value is 105C), in which case an immediate shutdown would 
probably be in order anyway (unless the user uses LN2 or something to 
cool the soc below zero).

If so, then there needs to be some explicit mechanism to force the two
drivers into probing in the right order.

Because of the above, I think it isn't necessary to probe these in order.

Cheers,
Mikko