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-rw-r--r--drivers/mailbox/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index d54e41206e17..4896f8dcae95 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
# Generic MAILBOX API
obj-$(CONFIG_MAILBOX) += mailbox.o
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