[U-Boot] [RFC PATCH v2 04/13] Makefile: Support include files for .dts files

[Simon Glass]

Linux supports this, and if we are to have compatible device tree files,
U-Boot should also.

Avoid giving the device tree files access to U-Boot's include/ directory.
Only include/dt-bindings is accessible.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v3:
- Create a symlink for each arch to dt-bindings

Changes in v2:
- Add new patch to support include files for .dts files

 arch/arm/dts/include/dt-bindings        | 1 +
 arch/microblaze/dts/include/dt-bindings | 1 +
 arch/sandbox/dts/include/dt-bindings    | 1 +
 arch/x86/dts/include/dt-bindings        | 1 +
 scripts/Makefile.lib                    | 1 +
 5 files changed, 5 insertions(+)
 create mode 120000 arch/arm/dts/include/dt-bindings
 create mode 120000 arch/microblaze/dts/include/dt-bindings
 create mode 120000 arch/sandbox/dts/include/dt-bindings
 create mode 120000 arch/x86/dts/include/dt-bindings

diff --git a/arch/arm/dts/include/dt-bindings b/arch/arm/dts/include/dt-bindings
new file mode 120000
index 0000000..0cecb3d
--- /dev/null
+++ b/arch/arm/dts/include/dt-bindings
@@ -0,0 +1 @@
+../../../../include/dt-bindings
\ No newline at end of file
diff --git a/arch/microblaze/dts/include/dt-bindings b/arch/microblaze/dts/include/dt-bindings
new file mode 120000
index 0000000..0cecb3d
--- /dev/null
+++ b/arch/microblaze/dts/include/dt-bindings
@@ -0,0 +1 @@
+../../../../include/dt-bindings
\ No newline at end of file
diff --git a/arch/sandbox/dts/include/dt-bindings b/arch/sandbox/dts/include/dt-bindings
new file mode 120000
index 0000000..0cecb3d
--- /dev/null
+++ b/arch/sandbox/dts/include/dt-bindings
@@ -0,0 +1 @@
+../../../../include/dt-bindings
\ No newline at end of file
diff --git a/arch/x86/dts/include/dt-bindings b/arch/x86/dts/include/dt-bindings
new file mode 120000
index 0000000..0cecb3d
--- /dev/null
+++ b/arch/x86/dts/include/dt-bindings
@@ -0,0 +1 @@
+../../../../include/dt-bindings
\ No newline at end of file
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index a04439d..722afed 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -153,6 +153,7 @@ ld_flags       = $(LDFLAGS) $(ldflags-y)
 # Modified for U-Boot
 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 		 -I$(srctree)/arch/$(ARCH)/dts                           \
+		 -I$(srctree)/arch/$(ARCH)/dts/include                   \
 		 -undef -D__DTS__
 
 # Finds the multi-part object the current object will be linked into
-- 
1.9.1.423.g4596e3a