libfdt: Add overlay application function
The device tree overlays are a good way to deal with user-modifyable
boards or boards with some kind of an expansion mechanism where we can
easily plug new board in (like the BBB, the Raspberry Pi or the CHIP).
Add a new function to merge overlays with a base device tree.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/lib/libfdt/Makefile b/lib/libfdt/Makefile
index 8b86c15..6ef8290 100644
--- a/lib/libfdt/Makefile
+++ b/lib/libfdt/Makefile
@@ -15,3 +15,5 @@
fdt_empty_tree.o \
fdt_addresses.o \
fdt_region.o
+
+obj-$(CONFIG_OF_LIBFDT_OVERLAY) += fdt_overlay.o