diff --git a/mailbox/arm_mhu_v2.c b/mailbox/arm_mhu_v2.c
index b65bd78..8c1a6e9 100644
--- a/mailbox/arm_mhu_v2.c
+++ b/mailbox/arm_mhu_v2.c
@@ -1,11 +1,23 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
 /*
+ * SPDX-FileCopyrightText: Copyright 2019-2021, 2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * This program is free software and is provided to you under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation, and any use by you of this program is subject to the terms
+ * of such GNU licence.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you can access it online at
+ * http://www.gnu.org/licenses/gpl-2.0.html.
+ *
  * Message Handling Unit version 2 controller driver
- * Copyright (C) 2019-2020 ARM Ltd.
- *
  * Based on drivers/mailbox/arm_mhu.c
- *
  */
 
 #include <linux/interrupt.h>
@@ -162,7 +174,7 @@
 	.last_tx_done = mhuv2_last_tx_done,
 };
 
-void mhuv2_check_enable_cmbint(struct mhuv2_link *link)
+static void mhuv2_check_enable_cmbint(struct mhuv2_link *link)
 {
 	const u32 aidr = readl_relaxed(link->rx_reg + MHU_V2_AIDR_OFS);
 
@@ -191,6 +203,7 @@
 	tx_base = of_iomap((struct device_node *)np, 0);
 	if (!tx_base) {
 		dev_err(dev, "failed to map tx registers\n");
+
 		return -ENOMEM;
 	}
 
@@ -198,6 +211,7 @@
 	if (!rx_base) {
 		dev_err(dev, "failed to map rx registers\n");
 		iounmap(tx_base);
+
 		return -ENOMEM;
 	}
 
@@ -272,6 +286,7 @@
 
 	mbox_controller_unregister(&mhuv2->mbox);
 }
+
 #else
 static int mhuv2_remove(struct amba_device *adev)
 {
@@ -281,8 +296,8 @@
 
 	return 0;
 }
-#endif
 
+#endif
 
 static struct amba_id mhuv2_ids[] = {
 	{