diff --git a/drivers/arm/rss/rss_comms_protocol.c b/drivers/arm/rss/rss_comms_protocol.c
new file mode 100644
index 0000000..4b3de54
--- /dev/null
+++ b/drivers/arm/rss/rss_comms_protocol.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#include <common/debug.h>
+#include "rss_comms_protocol.h"
+
+psa_status_t rss_protocol_serialize_msg(psa_handle_t handle,
+					int16_t type,
+					const psa_invec *in_vec,
+					uint8_t in_len,
+					const psa_outvec *out_vec,
+					uint8_t out_len,
+					struct serialized_rss_comms_msg_t *msg,
+					size_t *msg_len)
+{
+	psa_status_t status;
+
+	assert(msg != NULL);
+	assert(msg_len != NULL);
+	assert(in_vec != NULL);
+	assert(out_vec != NULL);
+
+	switch (msg->header.protocol_ver) {
+	case RSS_COMMS_PROTOCOL_EMBED:
+		status = rss_protocol_embed_serialize_msg(handle, type, in_vec, in_len, out_vec,
+							  out_len, &msg->msg.embed, msg_len);
+		if (status != PSA_SUCCESS) {
+			return status;
+		}
+		break;
+	case RSS_COMMS_PROTOCOL_POINTER_ACCESS:
+		status = rss_protocol_pointer_access_serialize_msg(handle, type, in_vec, in_len,
+								   out_vec, out_len,
+								   &msg->msg.pointer_access,
+								   msg_len);
+		if (status != PSA_SUCCESS) {
+			return status;
+		}
+		break;
+	default:
+		return PSA_ERROR_NOT_SUPPORTED;
+	}
+
+	*msg_len += sizeof(struct serialized_rss_comms_header_t);
+
+	return PSA_SUCCESS;
+}
+
+psa_status_t rss_protocol_deserialize_reply(psa_outvec *out_vec,
+					    uint8_t out_len,
+					    psa_status_t *return_val,
+					    const struct serialized_rss_comms_reply_t *reply,
+					    size_t reply_size)
+{
+	assert(reply != NULL);
+	assert(out_vec != NULL);
+	assert(return_val != NULL);
+
+	switch (reply->header.protocol_ver) {
+	case RSS_COMMS_PROTOCOL_EMBED:
+		return rss_protocol_embed_deserialize_reply(out_vec, out_len, return_val,
+							    &reply->reply.embed, reply_size);
+	case RSS_COMMS_PROTOCOL_POINTER_ACCESS:
+		return rss_protocol_pointer_access_deserialize_reply(out_vec, out_len, return_val,
+								     &reply->reply.pointer_access,
+								     reply_size);
+	default:
+		return PSA_ERROR_NOT_SUPPORTED;
+	}
+
+	return PSA_SUCCESS;
+}