diff --git a/plat/arm/css/drivers/scmi/scmi.h b/plat/arm/css/drivers/scmi/scmi.h
index 850402a..cf9ef5e 100644
--- a/plat/arm/css/drivers/scmi/scmi.h
+++ b/plat/arm/css/drivers/scmi/scmi.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -96,6 +96,10 @@
 	uint32_t db_preserve_mask;
 	/* The bit mask that need to be set to ring doorbell */
 	uint32_t db_modify_mask;
+	/* The handler for ringing doorbell */
+	void (*ring_doorbell)(struct scmi_channel_plat_info *plat_info);
+	/* cookie is unused now. But added for future enhancements. */
+	void *cookie;
 } scmi_channel_plat_info_t;
 
 /*
diff --git a/plat/arm/css/drivers/scmi/scmi_common.c b/plat/arm/css/drivers/scmi/scmi_common.c
index d0051c7..8482d21 100644
--- a/plat/arm/css/drivers/scmi/scmi_common.c
+++ b/plat/arm/css/drivers/scmi/scmi_common.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -39,9 +39,7 @@
 	 */
 	dmbst();
 
-	SCMI_RING_DOORBELL(ch->info->db_reg_addr, ch->info->db_modify_mask,
-					ch->info->db_preserve_mask);
-
+	ch->info->ring_doorbell(ch->info);
 	/*
 	 * Ensure that the write to the doorbell register is ordered prior to
 	 * checking whether the channel is free.
@@ -150,6 +148,7 @@
 	assert(ch->info->db_reg_addr);
 	assert(ch->info->db_modify_mask);
 	assert(ch->info->db_preserve_mask);
+	assert(ch->info->ring_doorbell != NULL);
 
 	assert(ch->lock);
 
diff --git a/plat/arm/css/drivers/scmi/scmi_private.h b/plat/arm/css/drivers/scmi/scmi_private.h
index 20e1e9b..a07841e 100644
--- a/plat/arm/css/drivers/scmi/scmi_private.h
+++ b/plat/arm/css/drivers/scmi/scmi_private.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -113,12 +113,6 @@
 		(val3) = mmio_read_32((uintptr_t)&payld_arr[2]);	\
 	} while (0)
 
-/* Helper macro to ring doorbell */
-#define SCMI_RING_DOORBELL(addr, modify_mask, preserve_mask)	do {	\
-		uint32_t db = mmio_read_32(addr) & (preserve_mask);	\
-		mmio_write_32(addr, db | (modify_mask));		\
-	} while (0)
-
 /*
  * Private data structure for representing the mailbox memory layout. Refer
  * the SCMI specification for more details.