diff --git a/plat/arm/board/juno/include/platform_def.h b/plat/arm/board/juno/include/platform_def.h
index 998e0e3..eddd7e5 100644
--- a/plat/arm/board/juno/include/platform_def.h
+++ b/plat/arm/board/juno/include/platform_def.h
@@ -300,4 +300,7 @@
 #define PLAT_VIRT_ADDR_SPACE_SIZE	(1ULL << 32)
 #endif
 
+/* Number of SCMI channels on the platform */
+#define PLAT_ARM_SCMI_CHANNEL_COUNT	U(1)
+
 #endif /* PLATFORM_DEF_H */
diff --git a/plat/arm/board/juno/juno_topology.c b/plat/arm/board/juno/juno_topology.c
index 052ab9f..075f512 100644
--- a/plat/arm/board/juno/juno_topology.c
+++ b/plat/arm/board/juno/juno_topology.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -20,7 +20,7 @@
 		.ring_doorbell = &mhu_ring_doorbell,
 };
 
-scmi_channel_plat_info_t *plat_css_get_scmi_info(void)
+scmi_channel_plat_info_t *plat_css_get_scmi_info(int channel_id)
 {
 	return &juno_scmi_plat_info;
 }
diff --git a/plat/arm/board/n1sdp/include/platform_def.h b/plat/arm/board/n1sdp/include/platform_def.h
index e8b8921..cc07852 100644
--- a/plat/arm/board/n1sdp/include/platform_def.h
+++ b/plat/arm/board/n1sdp/include/platform_def.h
@@ -143,4 +143,7 @@
 #define SBSA_SECURE_WDOG_BASE			UL(0x2A480000)
 #define SBSA_SECURE_WDOG_TIMEOUT		UL(100)
 
+/* Number of SCMI channels on the platform */
+#define PLAT_ARM_SCMI_CHANNEL_COUNT		U(1)
+
 #endif /* PLATFORM_DEF_H */
diff --git a/plat/arm/board/n1sdp/n1sdp_bl31_setup.c b/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
index b150b89..136287a 100644
--- a/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
+++ b/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -74,7 +74,7 @@
 	0
 };
 
-scmi_channel_plat_info_t *plat_css_get_scmi_info()
+scmi_channel_plat_info_t *plat_css_get_scmi_info(int channel_id)
 {
 	return &n1sdp_scmi_plat_info;
 }