boot/arm-trusted-firmware: support 32bit Arm targets

This change allows one to build the TF-A (Trusted Firmware A) for
32bit architectures Armv7 and Armv8 platforms. TF-A supports these
configuration since release v1.5.

Change dependency on BR2_aarch64 into a dependency on either
BR2_ARM_CPU_ARMV8A/BR2_ARM_CPU_ARMV7A to better define
the target architectures supported by the package.

Set package configuration directive ARM_ARCH_MAJOR according to
BR2_ARM_CPU_ARMV8A/BR2_ARM_CPU_ARMV7A. Set package configuration
directive ARCH based on BR2_aarch64/BR2_arm.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

boot/arm-trusted-firmware/Config.in

@@ -1,6 +1,7 @@
 config BR2_TARGET_ARM_TRUSTED_FIRMWARE
 	bool "ARM Trusted Firmware (ATF)"
-	depends on BR2_aarch64 && BR2_TARGET_UBOOT
+	depends on (BR2_ARM_CPU_ARMV8A || BR2_ARM_CPU_ARMV7A) && \
+		   BR2_TARGET_UBOOT
 	help
 	  Enable this option if you want to build the ATF for your ARM
 	  based embedded device.

boot/arm-trusted-firmware/arm-trusted-firmware.mk

@@ -35,6 +35,18 @@ ARM_TRUSTED_FIRMWARE_MAKE_OPTS += \
 	$(call qstrip,$(BR2_TARGET_ARM_TRUSTED_FIRMWARE_ADDITIONAL_VARIABLES)) \
 	PLAT=$(ARM_TRUSTED_FIRMWARE_PLATFORM)
 
+ifeq ($(BR2_ARM_CPU_ARMV7A),y)
+ARM_TRUSTED_FIRMWARE_MAKE_OPTS += ARM_ARCH_MAJOR=7
+else ifeq ($(BR2_ARM_CPU_ARMV8A),y)
+ARM_TRUSTED_FIRMWARE_MAKE_OPTS += ARM_ARCH_MAJOR=8
+endif
+
+ifeq ($(BR2_arm),y)
+ARM_TRUSTED_FIRMWARE_MAKE_OPTS += ARCH=aarch32
+else ifeq ($(BR2_aarch64),y)
+ARM_TRUSTED_FIRMWARE_MAKE_OPTS += ARCH=aarch64
+endif
+
 ifeq ($(BR2_TARGET_ARM_TRUSTED_FIRMWARE_UBOOT_AS_BL33),y)
 ARM_TRUSTED_FIRMWARE_MAKE_OPTS += BL33=$(BINARIES_DIR)/u-boot.bin
 ARM_TRUSTED_FIRMWARE_DEPENDENCIES += uboot