[PATCH] arm: Add Kconfig entry to select CONFIG_DTB_FILE

[Michal Orzel <michal.orzel@xxxxxxx>]

Currently in order to link existing DTB into Xen image
we need to either specify option CONFIG_DTB_FILE on the
command line or manually add it into .config.
Add Kconfig entries: CONFIG_LINK_DTB and CONFIG_DTB_FILE
to be able to select this option and provide the path to
DTB we want to embed into Xen image.

Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/Makefile |  2 --
 xen/common/Kconfig    | 14 ++++++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 16e6523e2c..104422960a 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -137,8 +137,6 @@ asm-offsets.s: $(TARGET_SUBARCH)/asm-offsets.c
 xen.lds: xen.lds.S
        $(CPP) -P $(a_flags) -MQ $@ -o $@ $<
 
-dtb.o: $(CONFIG_DTB_FILE)
-
 .PHONY: clean
 clean::
        rm -f asm-offsets.s xen.lds
diff --git a/xen/common/Kconfig b/xen/common/Kconfig
index eb953d171e..c032079c7e 100644
--- a/xen/common/Kconfig
+++ b/xen/common/Kconfig
@@ -400,6 +400,20 @@ config DOM0_MEM
 
          Leave empty if you are not sure what to specify.
 
+config LINK_DTB
+       bool "Link DTB into Xen image"
+       depends on ARM
+       default n
+
+config DTB_FILE
+       string "Absolute path to device tree blob"
+       default ""
+       depends on LINK_DTB
+       ---help---
+         When using a bootloader that has no device tree support or when there
+         is no bootloader at all, use this option to specify the absolute path
+         to a device tree that will be linked directly inside Xen binary.
+
 config TRACEBUFFER
        bool "Enable tracing infrastructure" if EXPERT
        default y
-- 
2.29.0