Archlinux on Rock5b

This works great.

Currently i messing around with the display resolution.
With armbian i needed to compile a dtb overlay.
rk3588-add-hdptxphy_hdmi_clk.dts from amazingfate
If i try to compile with
dtc -O dtb -o ~/rk3588-add-hdptxphy_hdmi_clk.dtbo ~/rk3588-add-hdptxphy_hdmi_clk.dts

i get
Error: /home/alarm/rk3588-add-hdptxphy_hdmi_clk.dts:1.1-2 syntax error FATAL ERROR: Unable to parse input tree

Do you have any advice to compile and use it in archlinux?

Thank you in advance

EDIT: It works the same way as in armbian - i had a typo in my dts file - now it works