soc: add stm32l100xb

This patch adds support for the stm32l100 SoC. Tested on private board.

Signed-off-by: Conny Marco Menebröcker <c-m-m@gmx.de>

soc/st/stm32/soc.yml

@@ -156,6 +156,7 @@ family:
     - name: stm32l081xx
   - name: stm32l1x
     socs:
+    - name: stm32l100xb
     - name: stm32l151xb
     - name: stm32l151xba
     - name: stm32l151xc

soc/st/stm32/stm32l1x/Kconfig.defconfig.stm32l100xb

@@ -0,0 +1,11 @@
+# STMicroelectronics STM32L100XB MCU
+
+# Copyright (c) 2025 Conny Marco Menebröcker
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_STM32L100XB
+
+config NUM_IRQS
+	default 46
+
+endif # SOC_STM32L100XB

soc/st/stm32/stm32l1x/Kconfig.soc

@@ -10,6 +10,10 @@ config SOC_SERIES_STM32L1X
 config SOC_SERIES
 	default "stm32l1x" if SOC_SERIES_STM32L1X
 
+config SOC_STM32L100XB
+	bool
+	select SOC_SERIES_STM32L1X
+
 config SOC_STM32L151XB
 	bool
 	select SOC_SERIES_STM32L1X
@@ -31,6 +35,7 @@ config SOC_STM32L152XE
 	select SOC_SERIES_STM32L1X
 
 config SOC
+	default "stm32l100xb" if SOC_STM32L100XB
 	default "stm32l151xb" if SOC_STM32L151XB
 	default "stm32l151xba" if SOC_STM32L151XBA
 	default "stm32l151xc" if SOC_STM32L151XC