powerpc: Support using upstream devicetrees

For new PowerPC developments, it will be useful to borrow devicetrees
from Linux. This patch makes it possible.

Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>

diff --git a/dts/upstream/src/powerpc/Makefile b/dts/upstream/src/powerpc/Makefile
new file mode 100644 (file)
index 0000000..721ec5c
--- /dev/null
+++ b/dts/upstream/src/powerpc/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+include $(srctree)/scripts/Makefile.dts
+
+# Add any required device tree compiler flags here
+DTC_FLAGS +=