diff --git a/plat/arm/board/morello/include/platform_def.h b/plat/arm/board/morello/include/platform_def.h
index 76e63aa78..993aa4687 100644
--- a/plat/arm/board/morello/include/platform_def.h
+++ b/plat/arm/board/morello/include/platform_def.h
@@ -163,7 +163,59 @@
 #define PLAT_MHUV2_BASE				PLAT_CSS_MHU_BASE
 #define PLAT_MAX_PWR_LVL			U(2)
 
-#define PLAT_ARM_G1S_IRQ_PROPS(grp)		CSS_G1S_IRQ_PROPS(grp)
+/* Interrupt handling constants */
+#define MORELLO_IRQ_SEC_UART			U(87)
+#define MORELLO_IRQ_DISPLAY_TCU_EVENT_Q		U(107)
+#define MORELLO_IRQ_DISPLAY_TCU_CMD_SYNC	U(111)
+#define MORELLO_IRQ_DISPLAY_TCU_GLOBAL		U(113)
+#define MORELLO_IRQ_MMU_TCU1_EVENT_Q		U(257)
+#define MORELLO_IRQ_MMU_TCU1_CMD_SYNC		U(258)
+#define MORELLO_IRQ_MMU_TCU1_GLOBAL		U(259)
+#define MORELLO_IRQ_MMU_TCU2_EVENT_Q		U(264)
+#define MORELLO_IRQ_MMU_TCU2_CMD_SYNC		U(265)
+#define MORELLO_IRQ_MMU_TCU2_GLOBAL		U(266)
+#define MORELLO_IRQ_CLUSTER0_MHU		U(349)
+#define MORELLO_IRQ_CLUSTER1_MHU		U(351)
+#define MORELLO_IRQ_P0_REFCLK			U(412)
+#define MORELLO_IRQ_P1_REFCLK			U(413)
+
+#define PLAT_ARM_G1S_IRQ_PROPS(grp) \
+	ARM_G1S_IRQ_PROPS(grp), \
+	INTR_PROP_DESC(CSS_IRQ_MHU, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(CSS_IRQ_TZ_WDOG, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(CSS_IRQ_SEC_SYS_TIMER, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_SEC_UART, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_DISPLAY_TCU_EVENT_Q, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_DISPLAY_TCU_CMD_SYNC, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_DISPLAY_TCU_GLOBAL, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_MMU_TCU1_EVENT_Q, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_MMU_TCU1_CMD_SYNC, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_MMU_TCU1_GLOBAL, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_MMU_TCU2_EVENT_Q, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_MMU_TCU2_CMD_SYNC, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_MMU_TCU2_GLOBAL, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_CLUSTER0_MHU, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_CLUSTER1_MHU, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_P0_REFCLK, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(MORELLO_IRQ_P1_REFCLK, \
+			GIC_HIGHEST_SEC_PRIORITY, grp, GIC_INTR_CFG_LEVEL)
+
 #define PLAT_ARM_G0_IRQ_PROPS(grp)		ARM_G0_IRQ_PROPS(grp)
 
 #define MORELLO_DEVICE_BASE			ULL(0x08000000)