[PATCH] scripts/Makefile.dts: tweak logic for deciding which dtbs to build

[Tom Rini]

On Thu, May 04, 2023 at 01:33:08PM +0200, Rasmus Villemoes wrote:

> The idea in 3609e1dc5f4d (dts: automatically build necessary .dtb
> files) was fine, but the implementation was suboptimal due to some
> misunderstandings on my part (and possibly defects in some defconfig
> files):
> 
> - Sometimes DEFAULT_DEVICE_TREE is not included in OF_LIST or
>   SPL_OF_LIST
> 
> - SPL_OF_LIST is not always a subset of OF_LIST
> 
> - While SPL_OF_LIST governs the list of dtbs relevant to SPL (i.e.,
>   may be built into an
>   SPL-with-bunch-of-dtbs-to-choose-between-at-runtime), those dtbs are
>   not actually _built_ during the SPL build phase, i.e. when $(SPL_)
>   would expand to SPL_. fdtgrep runs on the artifacts produced during
>   the ordinary U-Boot build.
> 
> Tweak the logic so that we simply add the union of all dtbs mentioned
> in either DEFAULT_DEVICE_TREE, OF_LIST and SPL_OF_LIST to dtb-y. That
> should, for real, ensure that we always build all the dtbs that is
> relevant to the current board, and should in turn enable us to
> massively simplify arch/*/dts/Makefile.
> 
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>

Tested-by: Tom Rini <trini at konsulko.com>

-- 
Tom
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