[U-Boot] [PATCH v2] dts/Makefile: Build the user specified dts

[Jagannadha Sutradharudu Teki]

This patch provides a support to build the user specified dts.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna at xilinx.com>
---
Changes for v2:
	- Update the logic for not giving an error if DEVICE_TREE defined
	- Documented the build steps 
 doc/README.fdt-control |    8 ++++++++
 dts/Makefile           |    2 ++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/doc/README.fdt-control b/doc/README.fdt-control
index 85bda03..8352835 100644
--- a/doc/README.fdt-control
+++ b/doc/README.fdt-control
@@ -156,6 +156,14 @@ To use this, put something like this in your board header file:
 
 #define CONFIG_EXTRA_ENV_SETTINGS	"fdtcontroladdr=10000\0"
 
+Build:
+
+After board configuration is done, fdt supported u-boot can be build in two ways:
+1)  build the default dts which is defined from CONFIG_DEFAULT_DEVICE_TREE
+    $ make
+2)  build the user specified dts file
+    $ make DEVICE_TREE=<dts-file-name>
+
 
 Limitations
 -----------
diff --git a/dts/Makefile b/dts/Makefile
index 785104e..01364d7 100644
--- a/dts/Makefile
+++ b/dts/Makefile
@@ -27,9 +27,11 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)libdts.o
 
+ifeq ($(DEVICE_TREE),)
 $(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
 $(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
 DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))
+endif
 
 $(if $(CONFIG_ARCH_DEVICE_TREE),,\
 $(error Your architecture does not have device tree support enabled. \
-- 
1.7.4