Issue with upstream BCM2835 thermal and hwmon.

[Michael Tatarinov]

2017-07-08 3:16 GMT+04:00, Stefan Wahren <stefan.wahren at i2se.com>:
> Hi Michael,
>
>> Michael Tatarinov <kukabu at gmail.com> hat am 7. Juli 2017 um 13:59
>> geschrieben:
>>
>>
>> 2017-07-07 15:32 GMT+04:00, Stefan Wahren <stefan.wahren at i2se.com>:
>> > Hi Michael,
>> >
>> > Am 07.07.2017 um 13:02 schrieb Michael Tatarinov:
>> >> Hello
>> >>
>> >> I uses custom kernel based on downstream code (branch rpi-4.12.y now).
>> >> My kernel builds with
>> >> CONFIG_HWMON=y
>> >> CONFIG_THERMAL=y
>> >> CONFIG_THERMAL_HWMON=y
>> >> The downstream thermal driver is registered in hwmon subsystem as
>> >> virtual device but the upstream isn't.
>> >> I'm not sure that the problem is in the upstream driver, maybe this is
>> >> my issue.
>> >> Does anybody can check it with upstream kernel?
>> >
>> > i didn't know about the relation between hwmon and thermal.
>>
>> The thermal subsystem have helper for hwmon.
>> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/thermal/Kconfig#n35
>>
>> > Could you please do me a favor and do the following steps:
>> > 1. Check with your upstream kernel that the thermal_zone is
>> > successfully
>> > registered under /sys/class/thermal.
>>
>> Yes, /sys/class/thermal is exists and I see the current data.
>>
>> > 2. Please show me the (missing) hwmon sysfs entries on your downstream
>> > kernel, because i won't trust some userspace program like sensors.
>>
>> mike at rpi ~ $ head /sys/class/hwmon/hwmon0/{name,temp1_input}
>> ==> /sys/class/hwmon/hwmon0/name <==
>> bcm2835_thermal
>>
>> ==> /sys/class/hwmon/hwmon0/temp1_input <==
>> 59451
>> mike at rpi ~ $
>
> thanks. I can reproduce it with my Raspberry Pi Zero W. But this behavior is
> desired and not an issue (since the driver has thermal_zone_params):
>
> https://github.com/torvalds/linux/commit/ccba4ffd9eff6120a20cc7656458ac554aec4b0c
>
> Please ask the thermal guys for a better explanation. Sorry

Thanks!