I just installed latest CubieTruck image (Armbian_20.08.2_Cubietruck_buster_current_5.8.6) and /sys/class/power_supply/axp20x-ac is missing.

With older image (Armbian_20.05.4_Cubietruck_buster_current_5.4.45) it was present.
Any ideas?

 

ls /sys/class/power_supply/

lrwxrwxrwx 1 root root 0 Okt 21 00:00 axp20x-battery -> ../../devices/platform/soc/1c2ac00.i2c/i2c-0/0-0034/axp20x-battery-power-supply/power_supply/axp20x-battery
lrwxrwxrwx 1 root root 0 Okt 21 00:00 axp20x-usb -> ../../devices/platform/soc/1c2ac00.i2c/i2c-0/0-0034/axp20x-usb-power-supply/power_supply/axp20x-usb

 

Hi there EtlARM,

 

I was debugging the same problem with different A20 board.

In my case the issue was wrong device tree.

After using the right device tree, symlinks under /sys/class/power_supply appeared.

 

You might want to double-check you have this node on your DT:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6df31af7d827ab8dbcf0baec0411813d7a709150

 

BR,
Filip

Hi, thanks for the input

 

Your link is for the Cubieboard 2, I have the CubieTruck (also numbered 3)

 

Looking at: https://linux-sunxi.org/Cubietech_Cubietruck

my Device-Tree should be: sun7i-a20-cubietruck.dtb

On my board, this file has a timestamp: 2020-10-20 22:15:29 (like all other .dtb files)

 

This also looks ok to me:

>  cat /proc/device-tree/model
Cubietech Cubietruck

 

I have no experience with Device-Tree.

Has someone an idea how to evaluate that further?

Just installed the missing Armbian updates -> no change to missing symlink.

 

Now timestamp of Device-Tree-Binary is 2021-01-05 23:17:53 (as expected with Armbian 20.11.6)

Looks like it has moved again: /sys/power/axp_pmu/ac on Armbian 21.08.0-trunk.77 Focal

The old battery info is at /sys/power/axp_pmu/axp20x-battery-power-supply/power_supply/axp20x-battery

"A foolish consistency is the hobgoblin of little minds."