[PATCH] scripts/dtc: drop yaml in DT validation

[João Marcos Costa]

The build issues found in dtc/yamltree were partially mitigated by a
previous commit (807bcd844a: "scripts/dtc: Fix pkg-config behavior under
sysroot"), but upstream dtc simply disabled yaml, and the same should be
done here in order to permanently avoid those issues.

Backport the change below from Linux v5.18 [1]:

ef8795f3f1c ("dt-bindings: kbuild: Use DTB files for validation")

I tested this patch with a couple Yocto builds: u-boot and u-boot-tools,
using the current master branch (rev. "c53b0708f9"), having removed
libyaml-native from u-boot-tools's dependencies.

[1] https://git.kernel.org/linus/ef8795f3f1ce

Signed-off-by: João Marcos Costa <joaomarcos.costa at bootlin.com>
---
 scripts/Makefile.lib             | 6 ------
 scripts/dtc/Makefile             | 8 --------
 scripts/dtc/update-dtc-source.sh | 2 +-
 3 files changed, 1 insertion(+), 15 deletions(-)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index b8969b7de54..d66f1ed13b1 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -86,12 +86,6 @@ base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m,
 extra-y				+= $(dtb-y)
 extra-$(CONFIG_OF_ALL_DTBS)	+= $(dtb-)
 
-# U-Boot specific
-ifneq ($(CHECK_DTBS),)
-extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
-extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
-endif
-
 # Add subdir path
 
 extra-y		:= $(addprefix $(obj)/,$(extra-y))
diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index 6f309b37e08..2ba8dba03be 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -17,15 +17,7 @@ fdtoverlay-objs	:= $(libfdt) fdtoverlay.o util.o
 # Source files need to get at the userspace version of libfdt_env.h to compile
 HOST_EXTRACFLAGS := -I$(srctree)/$(src)/libfdt
 
-ifeq ($(wildcard $(PKG_CONFIG_SYSROOT_DIR)/usr/include/yaml.h),)
 HOST_EXTRACFLAGS += -DNO_YAML
-else
-dtc-objs	+= yamltree.o
-# To include <yaml.h> installed in a non-default path
-HOSTCFLAGS_yamltree.o := $(shell pkg-config --cflags yaml-0.1)
-# To link libyaml installed in a non-default path
-HOSTLDLIBS_dtc	:= $(shell pkg-config --libs yaml-0.1)
-endif
 
 # Generated files need one more search path to include headers in source tree
 HOSTCFLAGS_dtc-lexer.lex.o := -I$(src)
diff --git a/scripts/dtc/update-dtc-source.sh b/scripts/dtc/update-dtc-source.sh
index 32ff17ffd08..94627541533 100755
--- a/scripts/dtc/update-dtc-source.sh
+++ b/scripts/dtc/update-dtc-source.sh
@@ -32,7 +32,7 @@ DTC_UPSTREAM_PATH=`pwd`/../dtc
 DTC_LINUX_PATH=`pwd`/scripts/dtc
 
 DTC_SOURCE="checks.c data.c dtc.c dtc.h flattree.c fstree.c livetree.c srcpos.c \
-		srcpos.h treesource.c util.c util.h version_gen.h yamltree.c \
+		srcpos.h treesource.c util.c util.h version_gen.h \
 		dtc-lexer.l dtc-parser.y"
 LIBFDT_SOURCE="fdt.c fdt.h fdt_addresses.c fdt_empty_tree.c \
 		fdt_overlay.c fdt_ro.c fdt_rw.c fdt_strerror.c fdt_sw.c \
-- 
2.47.0