diff --git a/soc/arm/st_stm32/stm32u5/Kconfig.defconfig.stm32u585xx b/soc/arm/st_stm32/stm32u5/Kconfig.defconfig.stm32u585xx
new file mode 100644
index 00000000000..d1ac8788b7a
--- /dev/null
+++ b/soc/arm/st_stm32/stm32u5/Kconfig.defconfig.stm32u585xx
@@ -0,0 +1,14 @@
+# STMicroelectronics STM32U585XX MCU
+
+# Copyright (c) 2021 Linaro Limited
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_STM32U585XX
+
+config SOC
+	default "stm32u585xx"
+
+config NUM_IRQS
+	default 125
+
+endif # SOC_STM32U585XX
diff --git a/soc/arm/st_stm32/stm32u5/Kconfig.soc b/soc/arm/st_stm32/stm32u5/Kconfig.soc
index c1a5a8f16f5..ea0b9f25b37 100644
--- a/soc/arm/st_stm32/stm32u5/Kconfig.soc
+++ b/soc/arm/st_stm32/stm32u5/Kconfig.soc
@@ -10,4 +10,7 @@ depends on SOC_SERIES_STM32U5X
 config SOC_STM32U575XX
 	bool "STM32U575XX"
 
+config SOC_STM32U585XX
+	bool "STM32U585XX"
+
 endchoice