RPi 4B - 6.1.y/6.2.y branch: thermal sensor isn't recognised

[puchu]

Describe the bug

up to the 6.0.y branch, it's possible to access the cpu thermal sensor value under /sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp1_input, starting with 6.1.y, the thermal sensor device isn't recognised anymore

Steps to reproduce the behaviour

create 6.1.y/6.2.y branch kernel config with "make bcm2711_defconfig" and compile

Device (s)

Raspberry Pi 4 Mod. B

System

.

Logs

No response

Additional context

No response

[pelwell]

Try this:

$ sudo rpi-update next
$ sudo reboot
...
$ uname -a
$ grep -s . /sys/devices/virtual/thermal/thermal_zone0/hwmon0/*

[puchu]

with the 6.0 branch:
$ uname -a
Linux foo 6.0.19-v8+ #175 SMP Sun Jan 15 15:21:08 CET 2023 aarch64 GNU/Linux
$ grep -s . /sys/devices/virtual/thermal/thermal_zone0/hwmon0/*
/sys/devices/virtual/thermal/thermal_zone0/hwmon0/name:cpu_thermal
/sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp1_input:43329

with the 6.1 branch:
$ uname -a
Linux foo 6.1.6-v8+ #2 SMP PREEMPT Tue Jan 17 13:05:51 CET 2023 aarch64 GNU/Linux
$ grep -s . /sys/devices/virtual/thermal/thermal_zone0/hwmon0/*
$

[pelwell]

Have you done what I asked you to and run sudo rpi-update next?

pi@raspberrypi:~$ grep -s . /sys/devices/virtual/thermal/thermal_zone0/hwmon0/*
/sys/devices/virtual/thermal/thermal_zone0/hwmon0/name:cpu_thermal
/sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp1_crit:110000
/sys/devices/virtual/thermal/thermal_zone0/hwmon0/temp1_input:55991
pi@raspberrypi:~$ uname -a
Linux raspberrypi 6.1.6-v8+ #1618 SMP PREEMPT Mon Jan 16 16:35:56 GMT 2023 aarch64 GNU/Linux

[puchu]

i couldn't use the script as it doesn't work on my distro, but i switched to the "next" firmware branch and now it works.

Thanks.

Is there a timeline when the "next" branch will become "stable"?

[pelwell]

If rpi-update next works for you but not your own build then there is something wrong with your build or installation.

There is no timeline for changing our master branch yet, let alone our stable branch. It's notable that the kernel devs haven't selected the next LTS branch - I was expecting 6.1 to be one, but that's looking less and less likely. We won't be choosing our next master kernel until that happens.

[puchu]

rpi-update didn't work because of the distro i use but i read the code and switched the firmware to the "next" branch which fixed the bug for me.

thank you very much!