Hi Zhang Thank you for your help > > non thermal-zon > > sensor command: OK > > read from /sys/class/thermal/thermal_zone0 : OK > > > > thermal-zon > > sensor command: NG > > read from /sys/class/thermal/thermal_zone0 : OK > > config THERMAL_HWMON > bool > prompt "Expose thermal sensors as hwmon device" > depends on HWMON=y || HWMON=THERMAL > default y > > please check if the thermal subsystem is built in, while hwmon subsystem > is built as module. > you should either set CONFIG_HWMON=y, or set both CONFIG_HWMON and > CONFIG_THERMAL as module. Thanks. but it seems our system has it. I noticed that thermal_zone case uses of_parse_thermal_zones() and it has this. /* No hwmon because there might be hwmon drivers registering */ tzp->no_hwmon = true; and on thermal_zone_device_register() check this for hwmon struct thermal_zone_device *thermal_zone_device_register(xxxx) { ... if (!tz->tzp || !tz->tzp->no_hwmon) { result = thermal_add_hwmon_sysfs(tz); ... } ... } Does this mean "thermal_zone doesn't use lm-senser" ?