Public bug reported:
Hello,
I'm using Raspberry Pi 4b with Ubuntu 21.10.
Seems like all 5.13 kernels don't have PWM support.
Replication steps:
- Enable pwm in config.txt:
`dtoverlay=pwm-2chan,pin=12,func=4,pin2=13,func2=4`
- Check /sys/class/pwm
Expected result:
PWM exists
- What I get:
```
root@raspberrypi:~# ls -l /sys/class/pwm/
total 0
root@raspberrypi:~#
```
---
Same output using 5.11.0-1021-raspi kernel:
```
root@raspberrypi:~# uname -a
Linux raspberrypi 5.11.0-1021-raspi #22-Ubuntu SMP PREEMPT Wed Oct 6 17:30:38
UTC 2021 aarch64 aarch64 aarch64 GNU/Linux
root@raspberrypi:~# ls -l /sys/class/pwm/
total 0
lrwxrwxrwx 1 root root 0 окт 31 00:49 pwmchip0 ->
../../devices/platform/soc/fe20c000.pwm/pwm/pwmchip0
```
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: hirsute
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https://bugs.launchpad.net/bugs/1949276
Title:
linux-image-raspi PWM not available
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