I have enabled the device tree overlay features in the kernel. Now I don't where i write the overlay device tree content. Can someone let me know regarding this?
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By definition it’s the user who provides a content of the overlay. – 0andriy Jun 11 '21 at 07:20
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You can theoretically write your .dts file wherever you want, provided you have the proper kernel sources, cross-compilation toolchain and dtc set up.
In practice you'd grab a copy of the kernel sources (ideally from the vendor of your SoC if that exists), then write the .dts file inside arch/arm[64]/boot/dts/[vendor]/overlay/$filename.dts. Then add it to the Makefile which you can find inside arch/arm[64]/boot/dts/[vendor]/overlay.
This will allow you to compile the dts file to a dtbo file by running make dtbs from the root of the kernel source.
Once you have a .dtbo, copy it to /boot/dtbs/[kernel-version]/[vendor]/[overlay]/, then add it to whatever configuration file gets used by your distribution to load overlays at boot-time. (For Raspberry-Pi it's /boot/config.txt, for debos, it's /boot/uEnv.txt)
kwisatz
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