kernel-build.mk: add support for compiling only DTS

Add support for compiling DTS for the selected target. This can be
useful for testing if the DTS correctly compile and doesn't produce any
error.

This adds a new make target. To compile only DTS use:

make target/linux/dtb

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

diff --git a/include/image.mk b/include/image.mk
index f5ab1d7953c5ae7a43b52c71388e550e1b14b726..4b6acbe1aad6ac707021d84e78ea1384967fa006 100644 (file)
--- a/include/image.mk
+++ b/include/image.mk
@@ -582,7 +582,7 @@ define Device/Build/dtb
   $(KDIR)/image-$(1).dtb: FORCE
        $(call Image/BuildDTB,$(strip $(2))/$(strip $(3)).dts,$$@)
 
-  image_prepare: $(KDIR)/image-$(1).dtb
+  compile-dtb: $(KDIR)/image-$(1).dtb
   endif
 
 endef
@@ -593,7 +593,7 @@ define Device/Build/dtbo
   $(KDIR)/image-$(1).dtbo: FORCE
        $(call Image/BuildDTBO,$(strip $(2))/$(strip $(3)).dtso,$$@)
 
-  image_prepare: $(KDIR)/image-$(1).dtbo
+  compile-dtb: $(KDIR)/image-$(1).dtbo
   endif
 
 endef
@@ -841,18 +841,20 @@ define BuildImage
   download:
   prepare:
   compile:
+  compile-dtb:
   clean:
   image_prepare:
 
   ifeq ($(IB),)
-    .PHONY: download prepare compile clean image_prepare kernel_prepare install install-images
+    .PHONY: download prepare compile compile-dtb clean image_prepare kernel_prepare install install-images
     compile:
                $(call Build/Compile)
 
     clean:
                $(call Build/Clean)
 
-    image_prepare: compile
+    compile-dtb:
+    image_prepare: compile compile-dtb
                mkdir -p $(BIN_DIR) $(KDIR)/tmp
                rm -rf $(BUILD_DIR)/json_info_files
                $(call Image/Prepare)

diff --git a/include/kernel-build.mk b/include/kernel-build.mk
index b9513ec41435fb732b22ab0cd63fc1ccc698b325..c42dae0049ba4f010c9833212074576f190afffe 100644 (file)
--- a/include/kernel-build.mk
+++ b/include/kernel-build.mk
@@ -156,6 +156,10 @@ define BuildKernel
   compile: $(LINUX_DIR)/.modules
        $(MAKE) -C image compile TARGET_BUILD=
 
+  dtb: $(STAMP_CONFIGURED)
+       $(_SINGLE)$(KERNEL_MAKE) scripts_dtc
+       $(MAKE) -C image compile-dtb TARGET_BUILD=
+
   oldconfig menuconfig nconfig xconfig: $(STAMP_PREPARED) $(STAMP_CHECKED) FORCE
        rm -f $(LINUX_DIR)/.config.prev
        rm -f $(STAMP_CONFIGURED)

diff --git a/include/subdir.mk b/include/subdir.mk
index 95009f814e29d4cab4f74c51fd30342484f5f111..b4edbf8b96c784cd8a7ed78996bb1ff715ceb9d0 100644 (file)
--- a/include/subdir.mk
+++ b/include/subdir.mk
@@ -5,6 +5,9 @@
 ifeq ($(MAKECMDGOALS),prereq)
   SUBTARGETS:=prereq
   PREREQ_ONLY:=1
+# For target/linux related target add dtb to selectively compile dtbs
+else ifneq ($(filter target/linux/%,$(MAKECMDGOALS)),)
+  SUBTARGETS:=$(DEFAULT_SUBDIR_TARGETS) dtb
 else
   SUBTARGETS:=$(DEFAULT_SUBDIR_TARGETS)
 endif