[PATCH 1/2] kbuild: fix DT binding schema rule again to avoid needless rebuilds

[PATCH 1/2] kbuild: fix DT binding schema rule again to avoid needless rebuilds

[Masahiro Yamada]

Since commit 7a0496056064 ("kbuild: fix DT binding schema rule to detect
command line changes"), this rule is every time re-run even if you change
nothing.

cmd_dtc takes one additional parameter to pass to the -O option of dtc.

We need to pass 'yaml' to if_changed_rule. Otherwise, cmd-check invoked
from if_changed_rule is false positive.

Fixes: 7a0496056064 ("kbuild: fix DT binding schema rule to detect command line changes")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 scripts/Makefile.lib | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 97547108ee7f..4b799737722c 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -309,7 +309,7 @@ define rule_dtc
 endef
 
 $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
-	$(call if_changed_rule,dtc)
+	$(call if_changed_rule,dtc,yaml)
 
 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 
-- 
2.25.1

[PATCH 2/2] kbuild: use separate commands for generating *.dtb and *.dt.yaml

[Masahiro Yamada]

Currently, cmd_dtc takes $(2) to select the target format. The
additional parameter complicates things when it is used with
cmd_and_fixdep and if_changed_rule.

To make it easier to understand, use a separate cmd_dtc_yaml.

One visible change is, 'DTC [Y]' is used for the log when compiling
*.dts to *.dt.yaml.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 scripts/Makefile.lib | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 4b799737722c..d5ac19e10e1d 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -284,32 +284,37 @@ cmd_dt_S_dtb=						\
 $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
 	$(call if_changed,dt_S_dtb)
 
-quiet_cmd_dtc = DTC     $@
-cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
+__cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 	$(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
-	$(DTC) -O $(2) -o $@ -b 0 \
+	$(DTC) -O $(1) -o $@ -b 0 \
 		$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
 	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
 
+quiet_cmd_dtc = DTC     $@
+      cmd_dtc = $(call __cmd_dtc,dtb)
+
 $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
-	$(call if_changed_dep,dtc,dtb)
+	$(call if_changed_dep,dtc)
 
 DT_CHECKER ?= dt-validate
 DT_BINDING_DIR := Documentation/devicetree/bindings
 # DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
 DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
 
+quiet_cmd_dtc_yaml = DTC [Y] $@
+      cmd_dtc_yaml = $(call __cmd_dtc,yaml)
+
 quiet_cmd_dtb_check =	CHECK   $@
       cmd_dtb_check =	$(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@
 
-define rule_dtc
-	$(call cmd_and_fixdep,dtc,yaml)
+define rule_dtc_yaml
+	$(call cmd_and_fixdep,dtc_yaml)
 	$(call cmd,dtb_check)
 endef
 
 $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
-	$(call if_changed_rule,dtc,yaml)
+	$(call if_changed_rule,dtc_yaml)
 
 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 
-- 
2.25.1