diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index ffbd4ca..e8461f5 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -364,6 +364,7 @@
 /* secure watchdog */
 void plat_arm_secure_wdt_start(void);
 void plat_arm_secure_wdt_stop(void);
+void plat_arm_secure_wdt_refresh(void);
 
 /* Get SOC-ID of ARM platform */
 uint32_t plat_arm_get_soc_id(void);
diff --git a/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index dde174c..f87f857 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2023, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -52,18 +52,21 @@
  * terminology. On a GICv2 system or mode, the interrupts will be treated as
  * Group 0 interrupts.
  */
-#define CSS_G1S_IRQ_PROPS(grp) \
+#define CSS_G1S_INT_PROPS(grp) \
 	INTR_PROP_DESC(CSS_IRQ_MHU, GIC_HIGHEST_SEC_PRIORITY, grp, \
 			GIC_INTR_CFG_LEVEL), \
 	INTR_PROP_DESC(CSS_IRQ_GPU_SMMU_0, GIC_HIGHEST_SEC_PRIORITY, grp, \
 			GIC_INTR_CFG_LEVEL), \
 	INTR_PROP_DESC(CSS_IRQ_TZC, 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)
 
+#define CSS_G1S_IRQ_PROPS(grp) \
+	CSS_G1S_INT_PROPS(grp), \
+	INTR_PROP_DESC(CSS_IRQ_TZ_WDOG, GIC_HIGHEST_SEC_PRIORITY, grp, \
+			GIC_INTR_CFG_LEVEL)
+
 #if CSS_USE_SCMI_SDS_DRIVER
 /* Memory region for shared data storage */
 #define PLAT_ARM_SDS_MEM_BASE		ARM_SHARED_RAM_BASE
diff --git a/plat/arm/board/tc/include/platform_def.h b/plat/arm/board/tc/include/platform_def.h
index eea1be6..59fff6e 100644
--- a/plat/arm/board/tc/include/platform_def.h
+++ b/plat/arm/board/tc/include/platform_def.h
@@ -212,8 +212,11 @@
 #define PLAT_ARM_DRAM2_SIZE		ULL(0x180000000)
 #define PLAT_ARM_DRAM2_END		(PLAT_ARM_DRAM2_BASE + PLAT_ARM_DRAM2_SIZE - 1ULL)
 
-#define PLAT_ARM_G1S_IRQ_PROPS(grp)	CSS_G1S_IRQ_PROPS(grp)
-#define PLAT_ARM_G0_IRQ_PROPS(grp)	ARM_G0_IRQ_PROPS(grp)
+#define PLAT_ARM_G1S_IRQ_PROPS(grp)	CSS_G1S_INT_PROPS(grp)
+#define PLAT_ARM_G0_IRQ_PROPS(grp)	ARM_G0_IRQ_PROPS(grp),	\
+					INTR_PROP_DESC(SBSA_SECURE_WDOG_INTID,	\
+						GIC_HIGHEST_SEC_PRIORITY, grp, \
+						GIC_INTR_CFG_LEVEL)
 
 #define PLAT_ARM_SP_IMAGE_STACK_BASE	(PLAT_SP_IMAGE_NS_BUF_BASE +	\
 					 PLAT_SP_IMAGE_NS_BUF_SIZE)
@@ -229,9 +232,11 @@
 #define PLAT_ARM_MEM_PROT_ADDR		(V2M_FLASH0_BASE + \
 					 V2M_FLASH0_SIZE - V2M_FLASH_BLOCK_SIZE)
 
-/*Secure Watchdog Constants */
-#define SBSA_SECURE_WDOG_BASE		UL(0x2A480000)
+/* Secure Watchdog Constants */
+#define SBSA_SECURE_WDOG_CONTROL_BASE	UL(0x2A480000)
+#define SBSA_SECURE_WDOG_REFRESH_BASE	UL(0x2A490000)
 #define SBSA_SECURE_WDOG_TIMEOUT	UL(100)
+#define SBSA_SECURE_WDOG_INTID		86
 
 #define PLAT_ARM_SCMI_CHANNEL_COUNT	1
 
diff --git a/plat/arm/board/tc/platform.mk b/plat/arm/board/tc/platform.mk
index 63a9237..c75507a 100644
--- a/plat/arm/board/tc/platform.mk
+++ b/plat/arm/board/tc/platform.mk
@@ -118,7 +118,8 @@
 				lib/fconf/fconf_dyn_cfg_getter.c	\
 				drivers/cfi/v2m/v2m_flash.c		\
 				lib/utils/mem_region.c			\
-				plat/arm/common/arm_nor_psci_mem_protect.c
+				plat/arm/common/arm_nor_psci_mem_protect.c	\
+				drivers/arm/sbsa/sbsa.c
 
 BL31_SOURCES		+=	${FDT_WRAPPERS_SOURCES}
 
diff --git a/plat/arm/board/tc/tc_bl31_setup.c b/plat/arm/board/tc/tc_bl31_setup.c
index 8ad1d30..630324f 100644
--- a/plat/arm/board/tc/tc_bl31_setup.c
+++ b/plat/arm/board/tc/tc_bl31_setup.c
@@ -13,6 +13,7 @@
 #include <common/debug.h>
 #include <drivers/arm/css/css_mhu_doorbell.h>
 #include <drivers/arm/css/scmi.h>
+#include <drivers/arm/sbsa.h>
 #include <lib/fconf/fconf.h>
 #include <lib/fconf/fconf_dyn_cfg_getter.h>
 #include <plat/arm/common/plat_arm.h>
@@ -81,3 +82,37 @@
 
 	fconf_populate("HW_CONFIG", hw_config_info->config_addr);
 }
+
+#if defined(SPD_spmd) && (SPMD_SPM_AT_SEL2 == 1)
+void tc_bl31_plat_runtime_setup(void)
+{
+	arm_bl31_plat_runtime_setup();
+
+	/* Start secure watchdog timer. */
+	plat_arm_secure_wdt_start();
+}
+
+void bl31_plat_runtime_setup(void)
+{
+	tc_bl31_plat_runtime_setup();
+}
+
+/*
+ * Platform handler for Group0 secure interrupt.
+ */
+int plat_spmd_handle_group0_interrupt(uint32_t intid)
+{
+	/* Trusted Watchdog timer is the only source of Group0 interrupt now. */
+	if (intid == SBSA_SECURE_WDOG_INTID) {
+		INFO("Watchdog restarted\n");
+		/* Refresh the timer. */
+		plat_arm_secure_wdt_refresh();
+
+		/* Deactivate the corresponding interrupt. */
+		plat_ic_end_of_interrupt(intid);
+		return 0;
+	}
+
+	return -1;
+}
+#endif /*defined(SPD_spmd) && (SPMD_SPM_AT_SEL2 == 1)*/
diff --git a/plat/arm/board/tc/tc_plat.c b/plat/arm/board/tc/tc_plat.c
index 228f2fa..766bfb5 100644
--- a/plat/arm/board/tc/tc_plat.c
+++ b/plat/arm/board/tc/tc_plat.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020-2023, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020-2023, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -147,10 +147,15 @@
 
 void plat_arm_secure_wdt_start(void)
 {
-	sbsa_wdog_start(SBSA_SECURE_WDOG_BASE, SBSA_SECURE_WDOG_TIMEOUT);
+	sbsa_wdog_start(SBSA_SECURE_WDOG_CONTROL_BASE, SBSA_SECURE_WDOG_TIMEOUT);
 }
 
 void plat_arm_secure_wdt_stop(void)
 {
-	sbsa_wdog_stop(SBSA_SECURE_WDOG_BASE);
+	sbsa_wdog_stop(SBSA_SECURE_WDOG_CONTROL_BASE);
+}
+
+void plat_arm_secure_wdt_refresh(void)
+{
+	sbsa_wdog_refresh(SBSA_SECURE_WDOG_REFRESH_BASE);
 }
diff --git a/plat/arm/common/arm_bl31_setup.c b/plat/arm/common/arm_bl31_setup.c
index 19efdd3..8c62a9b 100644
--- a/plat/arm/common/arm_bl31_setup.c
+++ b/plat/arm/common/arm_bl31_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2023, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -43,6 +43,7 @@
 #pragma weak bl31_platform_setup
 #pragma weak bl31_plat_arch_setup
 #pragma weak bl31_plat_get_next_image_ep_info
+#pragma weak bl31_plat_runtime_setup
 
 #define MAP_BL31_TOTAL		MAP_REGION_FLAT(			\
 					BL31_START,			\