[OE-core] [PATCH v2 1/2] devicetree.bbclass: Add virtual provider for dtb

[Manjukumar Matha]

Add virtual provider for dtb. This class can be used to generate dtb
from static devicetree, for reference see meta-xilinx layer
meta-xilinx/meta-xilinx-bsp/recipes-bsp/device-tree/device-tree.bb

By providing a virtual provider we can use it to differentiate between
in-kernel dtb or an external one. This can be set in local.conf as
PREFERRED_PROVIDER_virtual/dtb = "devicetree"

Signed-off-by: Manjukumar Matha <manjukumar.harthikote-matha at xilinx.com>
---
Changelog v2:
Update commit message to indicate PREFERRED_PROVIDER_virtual/dtb = "devicetree"
to set external devicetree recipe

 meta/classes/devicetree.bbclass | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/meta/classes/devicetree.bbclass b/meta/classes/devicetree.bbclass
index 8fe5a5e..e1f3779 100644
--- a/meta/classes/devicetree.bbclass
+++ b/meta/classes/devicetree.bbclass
@@ -27,6 +27,8 @@ inherit deploy kernel-arch
 
 COMPATIBLE_MACHINE ?= "^$"
 
+PROVIDES = "virtual/dtb"
+
 PACKAGE_ARCH = "${MACHINE_ARCH}"
 
 SYSROOT_DIRS += "/boot/devicetree"
-- 
2.7.4