[OE-core] [PATCH v3 3/4] kernel: fitimage: support device tree compiler options

[Yannick Gicquel]

This introduces a new variable to set the device tree compiler options while
calling mkimage ('-D' option). By default, this variable is not set but it can
be defined in a configuration file, as following example:

UBOOT_MKIMAGE_DTCOPTS = "-I dts -O dtb -p 2000"

Signed-off-by: Yannick Gicquel <yannick.gicquel at iot.bzh>
---
 meta/classes/kernel-fitimage.bbclass | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/meta/classes/kernel-fitimage.bbclass b/meta/classes/kernel-fitimage.bbclass
index e5b75ed..62e0017 100644
--- a/meta/classes/kernel-fitimage.bbclass
+++ b/meta/classes/kernel-fitimage.bbclass
@@ -17,6 +17,9 @@ python __anonymous () {
             d.appendVarFlag('do_assemble_fitimage', 'depends', ' ${INITRAMFS_IMAGE}:do_image_complete')
 }
 
+# Options for the device tree compiler passed to mkimage '-D' feature:
+UBOOT_MKIMAGE_DTCOPTS ??= ""
+
 #
 # Emit the fitImage ITS header
 #
@@ -209,7 +212,10 @@ do_assemble_fitimage() {
 		#
 		# Step 4: Assemble the image
 		#
-		uboot-mkimage -f fit-image.its arch/${ARCH}/boot/fitImage
+		uboot-mkimage \
+			${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \
+			-f fit-image.its \
+			arch/${ARCH}/boot/fitImage
 	fi
 }
 
-- 
1.9.1