The patch allows to configure sensors with a remote diode connected
and a on-chip local temperature sensor from the devicetree for the
board that uses this HWM. According to the documentation [1], this is
done by setting the corresponding bits in the Mode Selection Register
(22h). It is necessary for some Intel processors (Apollo Lake SoC)
that do not support PECI and the CPU temperature is taken from the
thermistor.
TEST = After loading the nct7802 module on the Kontron mAL-10 [2] with
Linux OS, we can see configuration of the HWM with one sensor in
the thermistor mode:
user@user-apl:~$ sensors
coretemp-isa-0000
Adapter: ISA adapter
Package id 0: +41.0°C (high = +110.0°C, crit = +110.0°C)
Core 0: +40.0°C (high = +110.0°C, crit = +110.0°C)
Core 1: +40.0°C (high = +110.0°C, crit = +110.0°C)
Core 2: +41.0°C (high = +110.0°C, crit = +110.0°C)
Core 3: +41.0°C (high = +110.0°C, crit = +110.0°C)
nct7802-i2c-0-2e
Adapter: SMBus CMI adapter cmi
in0: +3.35 V (min = +0.00 V, max = +4.09 V)
in1: +1.92 V
in3: +1.21 V (min = +0.00 V, max = +2.05 V)
in4: +1.68 V (min = +0.00 V, max = +2.05 V)
fan1: 0 RPM (min = 0 RPM)
fan2: 868 RPM (min = 0 RPM)
fan3: 0 RPM (min = 0 RPM)
temp1: +42.5°C (low = +0.0°C, high = +85.0°C)
(crit = +100.0°C) sensor = thermistor
temp4: +44.0°C (low = +0.0°C, high = +85.0°C)
(crit = +100.0°C)
temp6: +0.0°C
[1] page 30, section 7.2.32, Nuvoton Hardware Monitoring IC NCT7802Y
with PECI 3.0 interface, datasheet, revision 1.2, february 2012
[2] https://review.coreboot.org/c/coreboot/+/39133
Change-Id: I28cc4e5cae76cf0bcdad26a50ee6cd43a201d31e
Signed-off-by: Maxim Polyakov <max.senia.poliak@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39766
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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