include/trusted-firmware-a.mk: support LTS releases

TF-A LTS releases have an lts- prefix in their version tag. Introduce a
PKG_LTS variable to support these.

As the non-LTS tarbals do not contain the version prefix in the
directory, we need different PKG_BUILD_DIR for each variant:

➜ tar --list --file dl/trusted-firmware-a-v2.12.tar.gz  | head -n1
trusted-firmware-a-2.12/
➜ tar --list --file dl/trusted-firmware-a-lts-v2.12.1.tar.gz  | head -n1
trusted-firmware-a-lts-v2.12.1/

Signed-off-by: Stijn Tintel <[email protected]>

include/trusted-firmware-a.mk

@@ -1,12 +1,20 @@
 PKG_NAME ?= trusted-firmware-a
 PKG_CPE_ID ?= cpe:/a:arm:trusted_firmware-a
 
-ifndef PKG_SOURCE_PROTO
-PKG_SOURCE = trusted-firmware-a-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=https://codeload.github.com/TrustedFirmware-A/trusted-firmware-a/tar.gz/v$(PKG_VERSION)?
-endif
+PKG_LTS ?=
 
+ifneq ($(PKG_LTS),)
+PKG_VERSION_PREFIX:=lts-v
+PKG_BUILD_DIR = $(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-$(PKG_VERSION_PREFIX)$(PKG_VERSION)
+else
+PKG_VERSION_PREFIX:=v
 PKG_BUILD_DIR = $(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-$(PKG_VERSION)
+endif
+
+ifndef PKG_SOURCE_PROTO
+PKG_SOURCE = trusted-firmware-a-$(PKG_VERSION_PREFIX)$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://codeload.github.com/TrustedFirmware-A/trusted-firmware-a/tar.gz/$(PKG_VERSION_PREFIX)$(PKG_VERSION)?
+endif
 
 PKG_TARGETS := bin
 PKG_FLAGS:=nonshared
@@ -83,7 +91,7 @@ define Build/Compile/Trusted-Firmware-A
 		OPENSSL_DIR=$(STAGING_DIR_HOST) \
 		$(if $(DTC),DTC="$(DTC)") \
 		PLAT=$(PLAT) \
-		BUILD_STRING="OpenWrt v$(PKG_VERSION)-$(PKG_RELEASE) ($(VARIANT))" \
+		BUILD_STRING="OpenWrt $(PKG_VERSION_PREFIX)$(PKG_VERSION)-$(PKG_RELEASE) ($(VARIANT))" \
 		$(TFA_MAKE_FLAGS)
 endef