Yocto external kernel module including public header - header-files

Question

I have written an external kernel module, very close to the hello_mod example:
https://git.yoctoproject.org/cgit.cgi/poky/tree/meta-skeleton/recipes-kernel/hello-mod/hello-mod_0.1.bb
However, my kernel module also provides a public header file to be provided to all code using the module. However, this header is not installed to sysroot, nor to populate_sdk.
How can I achieve this? Do I have to manually add the file via FILES_${PN}_dev or modify the Makefile?

Answer 1

After chatting on yocto mailinglist I got the impression, that it is uncommon for kernel modules to install their own headers. Hence I opted for a simple do_install_append() into hello-mod.bb, like this:
do_install_append() {
install -d ${D}${includedir}/
install -m 644 ${S}/header.h ${D}${includedir}/header.h
}
FILES_${PN} += "${includedir}"
With a DEPENDS entry other recipes can now access the header via sysroot.
Regarding a solution inside the module Makefile: I found some reference about "make headers_install" but couldn't figure out to integrate this into my module Makefile, see How do I specify header files for make headers_install in an out-of-tree kernel module?