efi_loader: EFI_DEVICE_PATH_UTILITIES_PROTOCOL configurable

Allow the EFI_DEVICE_PATH_UTILITIES_PROTOCOL to be disabled via
configuration.

On systems that are very tight on U-Boot image size we may want to disable
the protocol. As it is required to run the UEFI Shell enable it by default.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

lib/efi_loader/Kconfig

@@ -208,6 +208,13 @@ config EFI_DEVICE_PATH_TO_TEXT
 	  The device path to text protocol converts device nodes and paths to
 	  human readable strings.
 
+config EFI_DEVICE_PATH_UTIL
+	bool "Device path utilities protocol"
+	default y
+	help
+	  The device path utilities protocol creates and manipulates device
+	  paths and device nodes. It is required to run the EFI Shell.
+
 config EFI_DT_FIXUP
 	bool "Device tree fixup protocol"
 	depends on !GENERATE_ACPI_TABLE

lib/efi_loader/Makefile

@@ -28,7 +28,7 @@ obj-$(CONFIG_EFI_CAPSULE_FIRMWARE) += efi_firmware.o
 obj-y += efi_console.o
 obj-y += efi_device_path.o
 obj-$(CONFIG_EFI_DEVICE_PATH_TO_TEXT) += efi_device_path_to_text.o
-obj-y += efi_device_path_utilities.o
+obj-$(CONFIG_EFI_DEVICE_PATH_UTIL) += efi_device_path_utilities.o
 ifeq ($(CONFIG_GENERATE_ACPI_TABLE),)
 obj-y += efi_dt_fixup.o
 endif

lib/efi_loader/efi_root_node.c

@@ -58,9 +58,11 @@ efi_status_t efi_root_node_register(void)
 			 &efi_guid_device_path_to_text_protocol,
 			 (void *)&efi_device_path_to_text,
 #endif
+#ifdef CONFIG_EFI_DEVICE_PATH_UTIL
 			 /* Device path utilities protocol */
 			 &efi_guid_device_path_utilities_protocol,
 			 (void *)&efi_device_path_utilities,
+#endif
 #ifdef CONFIG_EFI_DT_FIXUP
 			 /* Device-tree fix-up protocol */
 			 &efi_guid_dt_fixup_protocol,