With

Linux rock-5b 5.10.72-rockchip-rk3588 #trunk.0102 SMP Sat Nov 5 07:56:18 UTC 2022 aarch64 GNU/Linux

I see only one PWM controller

pi@rock-5b:~$ ls /sys/class/pwm/pwmchip1/
device  export  npwm  power  subsystem  uevent  unexport
pi@rock-5b:~$ cat /sys/class/pwm/pwmchip1/npwm
1

How do I figure out its header pin assignment?

 

Is there a device tree overlay to expose all 4 PWM controllers?

Edited November 22, 20223 yr by lurk101
spelling

Ok, looking at available overlays

pi@rock-5b:~$ ls /boot/dtb/rockchip/overlay/*pwm*
/boot/dtb/rockchip/overlay/rk3588-pwm12-m0.dtbo  /boot/dtb/rockchip/overlay/rk3588-pwm15-m3.dtbo
/boot/dtb/rockchip/overlay/rk3588-pwm13-m0.dtbo  /boot/dtb/rockchip/overlay/rk3588-pwm2-m1.dtbo
/boot/dtb/rockchip/overlay/rk3588-pwm13-m2.dtbo  /boot/dtb/rockchip/overlay/rk3588-pwm3-m1.dtbo
/boot/dtb/rockchip/overlay/rk3588-pwm14-m0.dtbo  /boot/dtb/rockchip/overlay/rk3588-pwm5-m2.dtbo
/boot/dtb/rockchip/overlay/rk3588-pwm14-m1.dtbo  /boot/dtb/rockchip/overlay/rk3588-pwm6-m2.dtbo
/boot/dtb/rockchip/overlay/rk3588-pwm15-m0.dtbo  /boot/dtb/rockchip/overlay/rk3588-pwm7-m3.dtbo
/boot/dtb/rockchip/overlay/rk3588-pwm15-m1.dtbo  /boot/dtb/rockchip/overlay/rk3588-pwm8-m0.dtbo

These seem to match the pin functions identified in the raxda rock-5b gpio pinout.

 

Looking at the armbianEnv file

pi@rock-5b:~$ cat /boot/armbianEnv.txt
verbosity=1
bootlogo=true
overlay_prefix=rockchip-rk3588
fdtfile=rockchip/rk3588-rock-5b.dtb
rootdev=UUID=e267943c-66ea-4d3c-b857-3a7208b48df4
rootfstype=ext4
usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u

If the overlay prefix 'rockchip-rk3588' is a prefix to dtbo files named in overlays= statement then how is it possible to add these dtbo files as overlay.

 

Or, are these not compatible?

Edited November 23, 20223 yr by lurk101

Here's what helped me with getting UARTs working. I haven't tried PWMs, but hope it should work for you as well.

 

sudo mkdir /boot/overlay-user/
sudo cp /boot/dtb-5.10.110-rockchip-rk3588/rockchip/overlay/rk3588-*.dtbo /boot/overlay-user/

 

And then add name(s) of the needed *.dtbo file(s) to the `/boot/armbianEnv.txt` and reboot.

 

...
user_overlays=rk3588-uart2-m0 rk3588-uart7-m2
...

 

Oh! Thanks, but I've given up on Armbian for the Rock-5b. The Radxa image suits me fine and boots from NMVE.

Will be resolved with https://github.com/armbian/build/pull/4734

In the mean time I had to rename the DTBO files from rock3588-....dtbo to rockchip-rk3588-....dtbo so that they could be used in arbianEnv.txt in the overlays= specification. Works fine for UART and PWM.

@Efe Çetin How does you PR finally resolve the issue? Rename all the .dtbo files, or change the overlay-prefix?

 

BTW, the pd-max-voltage-12v.dtbo for forcing a PD supply negotiation to 12V instead of a default 20V also works well when renamed appropriately.