diff --git a/drivers/firmware/scmi/mailbox_agent.c b/drivers/firmware/scmi/mailbox_agent.c
index 8e4af0c8fa..aa4929aafa 100644
--- a/drivers/firmware/scmi/mailbox_agent.c
+++ b/drivers/firmware/scmi/mailbox_agent.c
@@ -31,7 +31,9 @@ struct scmi_mbox_channel {
 	ulong timeout_us;
 };
 
-static int scmi_mbox_process_msg(struct udevice *dev, struct scmi_msg *msg)
+static int scmi_mbox_process_msg(struct udevice *dev,
+				 struct scmi_channel *channel,
+				 struct scmi_msg *msg)
 {
 	struct scmi_mbox_channel *chan = dev_get_plat(dev);
 	int ret;
diff --git a/drivers/firmware/scmi/optee_agent.c b/drivers/firmware/scmi/optee_agent.c
index bf0647bafd..771fa25e98 100644
--- a/drivers/firmware/scmi/optee_agent.c
+++ b/drivers/firmware/scmi/optee_agent.c
@@ -267,7 +267,9 @@ static void release_shm(struct udevice *dev, struct channel_session *sess)
 		tee_shm_free(sess->tee_shm);
 }
 
-static int scmi_optee_process_msg(struct udevice *dev, struct scmi_msg *msg)
+static int scmi_optee_process_msg(struct udevice *dev,
+				  struct scmi_channel *channel,
+				  struct scmi_msg *msg)
 {
 	struct channel_session sess = { };
 	int ret;
diff --git a/drivers/firmware/scmi/sandbox-scmi_agent.c b/drivers/firmware/scmi/sandbox-scmi_agent.c
index c555164d19..031882998d 100644
--- a/drivers/firmware/scmi/sandbox-scmi_agent.c
+++ b/drivers/firmware/scmi/sandbox-scmi_agent.c
@@ -471,6 +471,7 @@ static int sandbox_scmi_voltd_level_get(struct udevice *dev,
 }
 
 static int sandbox_scmi_test_process_msg(struct udevice *dev,
+					 struct scmi_channel *channel,
 					 struct scmi_msg *msg)
 {
 	switch (msg->protocol_id) {
diff --git a/drivers/firmware/scmi/scmi_agent-uclass.c b/drivers/firmware/scmi/scmi_agent-uclass.c
index 93cfc9c395..c9c9c00384 100644
--- a/drivers/firmware/scmi/scmi_agent-uclass.c
+++ b/drivers/firmware/scmi/scmi_agent-uclass.c
@@ -133,7 +133,7 @@ int devm_scmi_process_msg(struct udevice *dev, struct scmi_channel *channel,
 	ops = transport_dev_ops(parent);
 
 	if (ops->process_msg)
-		return ops->process_msg(parent, msg);
+		return ops->process_msg(parent, NULL, msg);
 
 	return -EPROTONOSUPPORT;
 }
diff --git a/drivers/firmware/scmi/smccc_agent.c b/drivers/firmware/scmi/smccc_agent.c
index 5e166ca93e..b7a930b24d 100644
--- a/drivers/firmware/scmi/smccc_agent.c
+++ b/drivers/firmware/scmi/smccc_agent.c
@@ -30,7 +30,9 @@ struct scmi_smccc_channel {
 	struct scmi_smt smt;
 };
 
-static int scmi_smccc_process_msg(struct udevice *dev, struct scmi_msg *msg)
+static int scmi_smccc_process_msg(struct udevice *dev,
+				  struct scmi_channel *channel,
+				  struct scmi_msg *msg)
 {
 	struct scmi_smccc_channel *chan = dev_get_plat(dev);
 	struct arm_smccc_res res;
diff --git a/include/scmi_agent-uclass.h b/include/scmi_agent-uclass.h
index 861ac6d110..562a4cc99a 100644
--- a/include/scmi_agent-uclass.h
+++ b/include/scmi_agent-uclass.h
@@ -7,6 +7,7 @@
 
 struct udevice;
 struct scmi_msg;
+struct scmi_channel;
 
 /**
  * struct scmi_transport_ops - The functions that a SCMI transport layer must implement.
@@ -18,7 +19,8 @@ struct scmi_agent_ops {
 	 * @dev:		SCMI protocol device using the transport
 	 * @msg:		SCMI message to be transmitted
 	 */
-	int (*process_msg)(struct udevice *dev, struct scmi_msg *msg);
+	int (*process_msg)(struct udevice *dev, struct scmi_channel *channel,
+			   struct scmi_msg *msg);
 };
 
 #endif /* _SCMI_TRANSPORT_UCLASS_H */