Re: [Buildroot] [PATCH v3 1/1] linux: make out-of-tree DTS work with newest kernels

[Michael Walle via buildroot <buildroot@buildroot.org>]

Hi,

> Fulfilling this kernel expectation would require a new
> configuration parameter for the name of the appropriate vendor
> subdirectory.

No, that doesn't work. The vendor part *has* to be included in this
config option as it may contain different device tree (file names).
Don't assume the vendor part will always be the same for different
device trees.

Somehow we have to split the source directory of the OOT device
trees and the (relative) destination within the kernel tree (eg.
'freescale/fsl-ls1028a-my-device-tree.dts', or just
'my-device-tree.dts'). Please keep in mind that the device trees
might also end up in the target filesystem in /boot and these might
also need the vendor prefix (see BR2_LINUX_KERNEL_DTB_KEEP_DIRNAME).

> It would also require changing the relative paths to included
> .dtsi files.

Yes, but I'd argue, that the current solution is broken in this
regard. Yes we shouldn't break things, but newer OOT device trees
should use the same #include directives as the in-tree device trees
to ease sharing the files between u-boot, linux and OOT external
trees. As of today, it's not (always) possible to use the same
(OOT) device tree for u-boot and linux in buildroot, i.e. if the
arch has subdirs and one use the OF_UPSTREAM configuration option in
u-boot.

-michael
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