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kbuild: determine base DTB by suffix

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When using the -dtbs syntax, you need to list the base first, as
follows:

    foo-dtbs := foo_base.dtb foo_overlay1.dtbo foo_overlay2.dtbo
    dtb-y := foo.dtb

You cannot do this arrangement:

    foo-dtbs := foo_overlay1.dtbo foo_overlay2.dtbo foo_base.dtb

This restriction comes from $(firstword ...) in the current
implementation, but it is unneeded to rely on the order in the
-dtbs syntax.

Instead, you can simply determine the base by the suffix because
the base (*.dtb) and overlays (*.dtbo) use different suffixes.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
This commit is contained in:
Masahiro Yamada 2023-12-03 17:05:48 +09:00
parent 53243e0983
commit cbe826b058
1 changed files with 2 additions and 2 deletions
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4
scripts/Makefile.lib
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@ -83,8 +83,8 @@ dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
# Primitive DTB compiled from *.dts
real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
# Base DTB that overlay is applied onto (each first word of $(*-dtbs) expansion)
base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m, .dtb, -dtbs)))
# Base DTB that overlay is applied onto
base-dtb-y := $(filter %.dtb, $(call real-search, $(multi-dtb-y), .dtb, -dtbs))
always-y += $(dtb-y)