package/linux-firmware: add support to copy entire directories

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: David BARBION <david.barbion@ext.leroymerlin.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/linux-firmware/linux-firmware.mk

@@ -293,6 +293,23 @@ LINUX_FIRMWARE_ALL_LICENSE_FILES += LICENCE.broadcom_bcm43xx
 endif
 
 ifneq ($(LINUX_FIRMWARE_FILES),)
+define LINUX_FIRMWARE_INSTALL_FILES
+	$(TAR) c -C $(@D) $(sort $(LINUX_FIRMWARE_FILES)) | \
+		$(TAR) x -C $(TARGET_DIR)/lib/firmware
+endef
+endif
+
+ifneq ($(LINUX_FIRMWARE_DIRS),)
+# We need to rm-rf the destination directory to avoid copying
+# into it in itself, should we re-install the package.
+define LINUX_FIRMWARE_INSTALL_DIRS
+	$(foreach d,$(LINUX_FIRMWARE_DIRS), \
+		rm -rf $(TARGET_DIR)/lib/firmware/$(d); \
+		cp -a $(@D)/$(d) $(TARGET_DIR)/lib/firmware/$(d)$(sep))
+endef
+endif
+
+ifneq ($(LINUX_FIRMWARE_FILES)$(LINUX_FIRMWARE_DIRS),)
 
 # Most firmware files are under a proprietary license, so no need to
 # repeat it for every selections above. Those firmwares that have more
@@ -308,12 +325,12 @@ LINUX_FIRMWARE_ALL_LICENSE_FILES += WHENCE
 # duplicates
 LINUX_FIRMWARE_LICENSE_FILES = $(sort $(LINUX_FIRMWARE_ALL_LICENSE_FILES))
 
+endif
+
 define LINUX_FIRMWARE_INSTALL_TARGET_CMDS
 	mkdir -p $(TARGET_DIR)/lib/firmware
-	$(TAR) c -C $(@D) $(sort $(LINUX_FIRMWARE_FILES)) | \
-		$(TAR) x -C $(TARGET_DIR)/lib/firmware
+	$(LINUX_FIRMWARE_INSTALL_FILES)
+	$(LINUX_FIRMWARE_INSTALL_DIRS)
 endef
 
-endif
-
 $(eval $(generic-package))