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kbuild: Allow .dtbo overlays to be built piecemeal

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Before 4.20, it was possible to build an arbitrary overlay by copying
it to arm/boot/dts/overlays/mytest-overlay.dts and running:

    make ARCH=arm overlays/mytest.dtbo

In 4.20 the .dtb build rules were centralised, requiring the dowstream
.dtbo build rules to be changed. They were, enough to support "make ...
dtbs", but not sufficiently to allow this ad-hoc, one-off building of
individual files.

Add the missing makefile rule to support this way of building.

See: https://github.com/raspberrypi/linux/issues/3250

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
This commit is contained in:
Phil Elwell
2019-09-23 09:26:41 +01:00
parent 9519b7e439
commit 29ee73a825
1 changed files with 3 additions and 0 deletions
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3
Makefile
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@@ -1223,6 +1223,9 @@ ifneq ($(dtstree),)
%.dtb: prepare3 scripts_dtc %.dtb: prepare3 scripts_dtc
$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
%.dtbo: prepare3 scripts_dtc
$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
PHONY += dtbs dtbs_install dt_binding_check PHONY += dtbs dtbs_install dt_binding_check
dtbs dtbs_check: prepare3 scripts_dtc dtbs dtbs_check: prepare3 scripts_dtc
$(Q)$(MAKE) $(build)=$(dtstree) $(Q)$(MAKE) $(build)=$(dtstree)