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>
(cherry picked from commit c47532b1ea7f8459f05a223a71317a1461c6e750)

diff --git a/include/image.mk b/include/image.mk
index dc53fe8b25f268d76e876110d52c06059528c4df..97cde011ce5da1d5450aa9794a988341d3bc1933 100644 (file)
--- a/include/image.mk
+++ b/include/image.mk
@@ -575,7 +575,7 @@ 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
@@ -586,7 +586,7 @@ 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
@@ -823,18 +823,20 @@ 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 5b332258f8b8c5e9ae3fc481d5d637ab03694380..435a2fecea0e30e2f2cfe58f0de22a93fb878dda 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