Me again; we moved the software stack to Jetson Nano 4g (compared to the earlier 2g), and the same problem emerged.
I did the full reflashing of the device to make sure that backlight pwm pin is assigned the appropriate function and settings.
In short, I see the following when I boot the device:
- devm 0x700031fc → 0x01
- devm 0x6000d504 → 0x02
Once I write:
devm 0x700031fc 8 0x45
I can run pwmchip0/pwm0 by hand and it works. How can I enforce this change to happen in device tree, and not manually?
Second part, when I put backlight-pwm driver on top of this pwm0_0, but it doesn’t work at all, with or without devm commands.
Any help is welcome.
Thanks in advance.