package/optee-client: add option to configure TEE-based storage location

OP-TEE provides the possibility of secure storage done by the
normal world OS via tee-supplicant.

The location is a compile-time value and by default it is /data/tee .
As this might not be suitable for all use-cases add an option to
set the CFG_TEE_FS_PARENT_PATH compile option.

Default value is still /data/tee as it was before adding this option.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/optee-client/Config.in

@@ -13,5 +13,17 @@ config BR2_PACKAGE_OPTEE_CLIENT
 
 	  https://github.com/OP-TEE/optee_client
 
+if BR2_PACKAGE_OPTEE_CLIENT
+
+config BR2_PACKAGE_OPTEE_CLIENT_TEE_FS_PATH
+	string "Path for normal world OS secure storage"
+	default "/data/tee"
+	help
+	  Path to storage area for secure storage based on the
+	  normal world OS providing the actual storage via
+	  tee-supplicant.
+
+endif
+
 comment "optee-client needs a toolchain w/ threads"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS

package/optee-client/optee-client.mk

@@ -10,6 +10,9 @@ OPTEE_CLIENT_LICENSE = BSD-2-Clause
 OPTEE_CLIENT_LICENSE_FILES = LICENSE
 OPTEE_CLIENT_INSTALL_STAGING = YES
 
+OPTEE_CLIENT_CONF_OPTS = \
+	-DCFG_TEE_FS_PARENT_PATH=$(BR2_PACKAGE_OPTEE_CLIENT_TEE_FS_PATH)
+
 define OPTEE_CLIENT_INSTALL_INIT_SYSV
 	$(INSTALL) -m 0755 -D $(OPTEE_CLIENT_PKGDIR)/S30optee \
 		$(TARGET_DIR)/etc/init.d/S30optee