Controlling CPU frequency - no 2GHz?

[generaleramon]

You can even go to 2,1Ghz, safely, at 1,25V instead of 2Ghz@1.3V by default.
https://wiki.pine64.org/index.php?title=...king#CPU_2
This require kernel compilation, but it worth it !

can you help me with this? i want to change clocks/voltages but i don't know how to work with dts/dtb/dtsi...

i tried to download these 3
rk3399-opp.dtsi
rk3399-pinebook-pro.dts
rk3399.dtsi

i tried to compile the dts using "dtc" but i get an error:
Error: rk3399-pinebook-pro.dts:7.1-2 syntax error
FATAL ERROR: Unable to parse input tree


if understand right i need to modify the dts/dtsi, compile it into a dtb, copy it in the /boot/dtbs/rockchip/ folder and compile the kernel?