diff --git a/dts/arm/st/f1/stm32f100Xb.dtsi b/dts/arm/st/f1/stm32f100Xb.dtsi
new file mode 100644
index 00000000000..19591d176c2
--- /dev/null
+++ b/dts/arm/st/f1/stm32f100Xb.dtsi
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2020 Jonas Eriksson, Up to Code AB
+ *
+ * SoC device tree include for STM32F100xB SoCs
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <mem.h>
+#include <st/f1/stm32f1.dtsi>
+
+/ {
+	sram0: memory@20000000 {
+		reg = <0x20000000 DT_SIZE_K(8)>;
+	};
+
+	soc {
+		flash-controller@40022000 {
+			flash0: flash@8000000 {
+				reg = <0x08000000 DT_SIZE_K(128)>;
+				erase-block-size = <DT_SIZE_K(1)>;
+			};
+		};
+
+		spi2: spi@40003800 {
+			compatible = "st,stm32-spi";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x40003800 0x400>;
+			clocks = <&rcc STM32_CLOCK_BUS_APB1 0x00004000>;
+			interrupts = <36 5>;
+			status = "disabled";
+			label = "SPI_2";
+		};
+	};
+};
diff --git a/dts/arm/st/f1/stm32f100Xe.dtsi b/dts/arm/st/f1/stm32f100Xe.dtsi
new file mode 100644
index 00000000000..93736ed582e
--- /dev/null
+++ b/dts/arm/st/f1/stm32f100Xe.dtsi
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2020 Jonas Eriksson, Up to Code AB
+ *
+ * SoC device tree include for STM32F100xE SoCs
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <mem.h>
+#include <st/f1/stm32f100Xb.dtsi>
+
+/ {
+	sram0: memory@20000000 {
+		reg = <0x20000000 DT_SIZE_K(32)>;
+	};
+
+	soc {
+		flash-controller@40022000 {
+			flash0: flash@8000000 {
+				reg = <0x08000000 DT_SIZE_K(512)>;
+			};
+		};
+
+		spi3: spi@40003c00 {
+			compatible = "st,stm32-spi";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x40003c00 0x400>;
+			clocks = <&rcc STM32_CLOCK_BUS_APB1 0x00008000>;
+			interrupts = <51 5>;
+			status = "disabled";
+			label = "SPI_3";
+		};
+	};
+};
diff --git a/soc/arm/st_stm32/stm32f1/Kconfig.defconfig.stm32f100xx b/soc/arm/st_stm32/stm32f1/Kconfig.defconfig.stm32f100xx
new file mode 100644
index 00000000000..916d2fd3d31
--- /dev/null
+++ b/soc/arm/st_stm32/stm32f1/Kconfig.defconfig.stm32f100xx
@@ -0,0 +1,24 @@
+# ST Microelectronics STM32F100XX MCU
+
+# Copyright (c) 2020, Jonas Eriksson, Up to Code AB
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_STM32F100XB
+
+config SOC
+	default "stm32f100xb"
+
+config NUM_IRQS
+	default 56
+
+endif # SOC_STM32F100XB
+
+if SOC_STM32F100XE
+
+config SOC
+	default "stm32f100xe"
+
+config NUM_IRQS
+	default 61
+
+endif # SOC_STM32F100XE
diff --git a/soc/arm/st_stm32/stm32f1/Kconfig.soc b/soc/arm/st_stm32/stm32f1/Kconfig.soc
index 00799a3d0aa..5aa88faf5ea 100644
--- a/soc/arm/st_stm32/stm32f1/Kconfig.soc
+++ b/soc/arm/st_stm32/stm32f1/Kconfig.soc
@@ -8,6 +8,14 @@ choice
 	prompt "STM32F1x MCU Selection"
 	depends on SOC_SERIES_STM32F1X
 
+config SOC_STM32F100XB
+	bool "STM32F100XB"
+	select SOC_STM32F10X_DENSITY_DEVICE
+
+config SOC_STM32F100XE
+	bool "STM32F100XE"
+	select SOC_STM32F10X_DENSITY_DEVICE
+
 config SOC_STM32F103XE
 	bool "STM32F103XE"
 	select SOC_STM32F10X_DENSITY_DEVICE