spl: unbreak CONFIG_SPL_MULTI_DTB_FIT after fixing CONFIG_OF_EMBED

With commit 9bd76b8076 ("spl: make CONFIG_OF_EMBED pass dts through
fdtgrep"), CONFIG_SPL_MULTI_DTB_FIT has been broken because
cmd_fdtgrep was now unknown in scripts/Makefile.spl after moving
it to dts/Makefile. This bug has been introduced with v2018.01.

This patch moves cmd_fdtgrep from dts/Makefile to scripts/Makefile.lib
and includes scripts/Makefile.lib in scripts/Makefile.spl.

Fixes: 9bd76b8076 ("spl: make CONFIG_OF_EMBED pass dts through fdtgrep")
Reported-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Simon Goldschmidt <sgoldschmidt@de.pepperl-fuchs.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>

dts/Makefile

@@ -22,22 +22,6 @@ DTB := $(ARCH_PATH)/$(DEVICE_TREE).dtb
 dtb_depends += $(DTB:.dtb=.dts)
 endif
 
-# Pass the original device tree file through fdtgrep twice. The first pass
-# removes any unwanted nodes (i.e. those which don't have the
-# 'u-boot,dm-pre-reloc' property and thus are not needed by SPL. The second
-# pass removes various unused properties from the remaining nodes.
-# The output is typically a much smaller device tree file.
-ifeq ($(CONFIG_TPL_BUILD),y)
-fdtgrep_props := -b u-boot,dm-pre-reloc -b u-boot,dm-tpl
-else
-fdtgrep_props := -b u-boot,dm-pre-reloc -b u-boot,dm-spl
-endif
-quiet_cmd_fdtgrep = FDTGREP $@
-      cmd_fdtgrep = $(objtree)/tools/fdtgrep $(fdtgrep_props) -RT $< \
-		-n /chosen -n /config -O dtb | \
-	$(objtree)/tools/fdtgrep -r -O dtb - -o $@ \
-		$(addprefix -P ,$(subst $\",,$(CONFIG_OF_SPL_REMOVE_PROPS)))
-
 $(obj)/dt-spl.dtb: $(DTB) $(objtree)/tools/fdtgrep FORCE
 	$(call if_changed,fdtgrep)
 

scripts/Makefile.lib

@@ -522,3 +522,21 @@ MKIMAGEOUTPUT ?= /dev/null
 quiet_cmd_mkimage = MKIMAGE $@
 cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
 	$(if $(KBUILD_VERBOSE:1=), >$(MKIMAGEOUTPUT))
+
+# fdtgrep
+# ---------------------------------------------------------------------------
+# Pass the original device tree file through fdtgrep twice. The first pass
+# removes any unwanted nodes (i.e. those which don't have the
+# 'u-boot,dm-pre-reloc' property and thus are not needed by SPL. The second
+# pass removes various unused properties from the remaining nodes.
+# The output is typically a much smaller device tree file.
+ifeq ($(CONFIG_TPL_BUILD),y)
+fdtgrep_props := -b u-boot,dm-pre-reloc -b u-boot,dm-tpl
+else
+fdtgrep_props := -b u-boot,dm-pre-reloc -b u-boot,dm-spl
+endif
+quiet_cmd_fdtgrep = FDTGREP $@
+      cmd_fdtgrep = $(objtree)/tools/fdtgrep $(fdtgrep_props) -RT $< \
+		-n /chosen -n /config -O dtb | \
+	$(objtree)/tools/fdtgrep -r -O dtb - -o $@ \
+		$(addprefix -P ,$(subst $\",,$(CONFIG_OF_SPL_REMOVE_PROPS)))

scripts/Makefile.spl

@@ -50,6 +50,8 @@ endif
 include $(srctree)/config.mk
 include $(srctree)/arch/$(ARCH)/Makefile
 
+include $(srctree)/scripts/Makefile.lib
+
 # Enable garbage collection of un-used sections for SPL
 KBUILD_CFLAGS += -ffunction-sections -fdata-sections
 LDFLAGS_FINAL += --gc-sections