wireless-regdb: install crda files only if used

Since linux-4.15 the kernel supports loading the files
regulatory.db/regulatory.db.p7s directly from the /lib/firmware
directory, for earlier versions the crda helper application
is needed.

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/wireless-regdb/Config.in

@@ -3,7 +3,12 @@ config BR2_PACKAGE_WIRELESS_REGDB
 	help
 	  Wireless regulatory database.
 
-	  Wireless regulatory database for CRDA. The database lists the
+	  Wireless regulatory database. The database lists the
 	  allowed radio frequencies for each local jurisdiction.
 
+	  Since linux-4.15 the kernel supports loading the files
+	  regulatory.db/regulatory.db.p7s directly from the
+	  /lib/firmware directory, for earlier versions the crda helper
+	  application is needed.
+
 	  https://wireless.wiki.kernel.org/en/developers/regulatory/wireless-regdb

package/wireless-regdb/wireless-regdb.mk

@@ -10,11 +10,17 @@ WIRELESS_REGDB_SITE = http://kernel.org/pub/software/network/wireless-regdb
 WIRELESS_REGDB_LICENSE = ISC
 WIRELESS_REGDB_LICENSE_FILES = LICENSE
 
-define WIRELESS_REGDB_INSTALL_TARGET_CMDS
+ifeq ($(BR2_PACKAGE_CRDA),y)
+define  WIRELESS_REGDB_INSTALL_CRDA_TARGET_CMDS
 	$(INSTALL) -m 644 -D -T $(@D)/regulatory.bin \
 		$(TARGET_DIR)/usr/lib/crda/regulatory.bin
 	$(INSTALL) -m 644 -D -T $(@D)/sforshee.key.pub.pem \
 		$(TARGET_DIR)/etc/wireless-regdb/pubkeys/sforshee.key.pub.pem
+endef
+endif
+
+define WIRELESS_REGDB_INSTALL_TARGET_CMDS
+	$(WIRELESS_REGDB_INSTALL_CRDA_TARGET_CMDS)
 	$(INSTALL) -m 644 -D -T $(@D)/regulatory.db \
 		$(TARGET_DIR)/lib/firmware/regulatory.db
 	$(INSTALL) -m 644 -D -T $(@D)/regulatory.db.p7s \