aw_thermal breakage on Allwinner H3 SoC

[Jared McNeill]

On Tue, 25 Oct 2016, Milan Obuch wrote:

> One more observation: booting verbose shows following
> aw_thermal0: <Allwinner Thermal Sensor Controller> mem 0x1c25000-0x1c253ff irq 29 on simplebus0
> aw_thermal0: #0: alarm 42C hyst 15C shut 65C
>
> which is for me wrong - shutdown temperature 65 degrees is unacceptably
> low.

Agreed. Those numbers are the SoC default values.

It looks like the thresholds should be defined in a thermal-zones node in 
the dts, but there is none defined in sun8i-h3.dtsi. We'll have to come up 
with some reasonable defaults, add them to our dts, and then add support 
for reading the trip points to the aw_thermal driver.

Cheers,
Jared