I read the answer of the other post.( that is your answer.)
"If you know how to make overlays, you can give nightly dev images a try, I haven't made PWM overlays yet though."
This means there is no solution.
But, in this post says "It's working perfectly. You need the correct files for dts/dtb, otherwise it will not work." from mbohmer.
So, I asked how to correct files for dts/dtb.
I really want to know the method.