diff --git a/include/asm-blackfin/serial.h b/include/asm-blackfin/serial.h
new file mode 100644
index 000000000000..994dd869558c
--- /dev/null
+++ b/include/asm-blackfin/serial.h
@@ -0,0 +1,5 @@
+/*
+ * include/asm-blackfin/serial.h
+ */
+
+#define SERIAL_EXTRA_IRQ_FLAGS IRQF_TRIGGER_HIGH