diff --git a/drivers/renesas/common/watchdog/swdt.c b/drivers/renesas/common/watchdog/swdt.c
index 1a351ca..29ef6f4 100644
--- a/drivers/renesas/common/watchdog/swdt.c
+++ b/drivers/renesas/common/watchdog/swdt.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2020, Renesas Electronics Corporation. All rights reserved.
+ * Copyright (c) 2015-2021, Renesas Electronics Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -78,7 +78,7 @@
 void rcar_swdt_init(void)
 {
 	uint32_t rmsk, sr;
-#if (RCAR_LSI != RCAR_E3) && (RCAR_LSI != RZ_G2E)
+#if (RCAR_LSI != RCAR_E3) && (RCAR_LSI != RCAR_D3) && (RCAR_LSI != RZ_G2E)
 	uint32_t reg, val, product_cut, chk_data;
 
 	reg = mmio_read_32(RCAR_PRR);
@@ -96,6 +96,8 @@
 
 #if (RCAR_LSI == RCAR_E3) || (RCAR_LSI == RZ_G2E)
 	mmio_write_32(SWDT_WTCNT, WTCNT_UPPER_BYTE | WTCNT_COUNT_7p81k);
+#elif (RCAR_LSI == RCAR_D3)
+	mmio_write_32(SWDT_WTCNT, WTCNT_UPPER_BYTE | WTCNT_COUNT_8p13k);
 #else
 	val = WTCNT_UPPER_BYTE;