[PATCH v2] u-boot: Improve extra template variables usage

[Anton Mikanovich <amikan@ilbers.de>]

Commit 1b0ea08f introduced BL31 and TEE variables to be used in custom
u-boot recipes. Summarize them to U_BOOT_EXTRA_BUILDARGS (with default
to the same values) to allow any custom variables to be set.

Signed-off-by: Anton Mikanovich <amikan@ilbers.de>
---
Changes since v1:
 - Fixed typo in commit message

 meta/recipes-bsp/u-boot/files/debian/rules.tmpl | 2 +-
 meta/recipes-bsp/u-boot/u-boot-custom.inc       | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/meta/recipes-bsp/u-boot/files/debian/rules.tmpl b/meta/recipes-bsp/u-boot/files/debian/rules.tmpl
index 53c85451..f4c161aa 100755
--- a/meta/recipes-bsp/u-boot/files/debian/rules.tmpl
+++ b/meta/recipes-bsp/u-boot/files/debian/rules.tmpl
@@ -14,7 +14,7 @@ endif
 
 override_dh_auto_build:
 	$(MAKE) $(PARALLEL_MAKE) ${U_BOOT_CONFIG}
-	$(MAKE) $(PARALLEL_MAKE) BL31=${BL31} TEE=${TEE} ${U_BOOT_BIN}
+	$(MAKE) $(PARALLEL_MAKE) ${U_BOOT_EXTRA_BUILDARGS} ${U_BOOT_BIN}
 	$(MAKE) -n u-boot-initial-env >/dev/null 2>&1; if [ $$? -ne 2 ]; then \
 		$(MAKE) $(PARALLEL_MAKE) u-boot-initial-env; \
 	else \
diff --git a/meta/recipes-bsp/u-boot/u-boot-custom.inc b/meta/recipes-bsp/u-boot/u-boot-custom.inc
index 017e8336..a7b6cb0b 100644
--- a/meta/recipes-bsp/u-boot/u-boot-custom.inc
+++ b/meta/recipes-bsp/u-boot/u-boot-custom.inc
@@ -22,9 +22,11 @@ DEBIAN_BUILD_DEPENDS ?= "bc, bison, flex, device-tree-compiler, git"
 
 U_BOOT_BIN_INSTALL ?= "${U_BOOT_BIN}"
 
+U_BOOT_EXTRA_BUILDARGS ??= "BL31=${BL31} TEE=${TEE}"
+
 TEMPLATE_FILES = "debian/control.tmpl debian/rules.tmpl"
 TEMPLATE_VARS += "MACHINE DEBIAN_BUILD_DEPENDS U_BOOT_CONFIG U_BOOT_BIN \
-    BL31 TEE"
+    U_BOOT_EXTRA_BUILDARGS"
 
 U_BOOT_TOOLS_PACKAGE ?= "0"
 U_BOOT_CONFIG_PACKAGE ?= "0"
-- 
2.34.1