Alpine release 3.17.1 kernel pwm drivers missing
Looks like the pwm kmods have been dropped from release 3.17.1 (they are present in 3.17) aarch64, rpi4
diff <(cd 3.17/squashfs-root/modules/5.15.79-0-rpi4 && find .) <(cd 3.17.1/squashfs-root/modules/5.15.86-0-rpi4 && find .)
698,701d697
< ./kernel/drivers/pwm
< ./kernel/drivers/pwm/pwm-raspberrypi-poe.ko
< ./kernel/drivers/pwm/pwm-pca9685.ko
< ./kernel/drivers/pwm/pwm-bcm2835.ko
815a812
> ./kernel/drivers/net/can/usb/usb_8dev.ko
1100d1096
< ./kernel/drivers/media/rc/pwm-ir-tx.ko
1495d1490
< ./kernel/drivers/hwmon/pwm-fan.ko
1533d1527
< ./kernel/drivers/video/backlight/pwm_bl.ko
1943a1938
> ./kernel/crypto/twofish_generic.ko
1946a1942
> ./kernel/crypto/twofish_common.ko
This stops the Raspberry Pi PoE+ Hat fan from working.