From 586df29178f2edf343d193eaad923bec58d84782 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Thu, 8 Feb 2024 00:49:27 +0100
Subject: [PATCH] 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>
---
 include/image.mk        | 10 ++++++----
 include/kernel-build.mk |  4 ++++
 include/subdir.mk       |  3 +++
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/include/image.mk b/include/image.mk
index fae4d32a8..05ed2362d 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -564,7 +564,7 @@ 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
@@ -575,7 +575,7 @@ 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
@@ -812,18 +812,20 @@ 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 5b332258f..435a2fece 100644
--- 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 $(STAMP_CONFIGURED)
diff --git a/include/subdir.mk b/include/subdir.mk
index 95009f814..b4edbf8b9 100644
--- a/include/subdir.mk
+++ b/include/subdir.mk
@@ -5,6 +5,9 @@
 ifeq ($(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