soc: stm32: add initial soc support for stm32mp2x

Add initial soc support for the stm32mp2x series, including
initial Kconfig entries and default configuration files.
This enables Zephyr to recognize and build for the stm32mp2x series,
taking the stm32mp257f_ev1 as a baseline.

Includes:
- Kconfig and defconfig files for SoC selection and defaults
- soc.h for hal headers
- CMakeLists.txt for build system integration
- soc.yml update to register the new SoC

System Clock is configured statically from DTS. So no initialization
hook or soc.c needed.

Signed-off-by: Youssef Zini <youssef.zini@savoirfairelinux.com>

soc/st/stm32/soc.yml

@@ -193,6 +193,11 @@ family:
   - name: stm32mp13x
     socs:
     - name: stm32mp135fxx
+  - name: stm32mp2x
+    socs:
+    - name: stm32mp257fxx
+      cpuclusters:
+      - name: m33
   - name: stm32n6x
     socs:
     - name: stm32n657xx

soc/st/stm32/stm32mp2x/CMakeLists.txt

@@ -0,0 +1,9 @@
+# Copyright (C) 2025 Savoir-faire Linux, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_include_directories(.)
+
+if(CONFIG_CPU_CORTEX_M33)
+  add_subdirectory(m33)
+endif()

soc/st/stm32/stm32mp2x/Kconfig

@@ -0,0 +1,17 @@
+# STMicroelectronics STM32MP2 MPU series
+#
+# Copyright (C) 2025 Savoir-faire Linux, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+config SOC_SERIES_STM32MP2X
+	select ARM
+	select CPU_HAS_FPU
+	select HAS_STM32CUBE
+
+config SOC_STM32MP2X_M33
+	select ARMV8_M_DSP
+	select ARM_TRUSTZONE_M
+	select CPU_CORTEX_M33
+	select CPU_CORTEX_M_HAS_DWT
+	select CPU_HAS_ARM_MPU
+	select CPU_HAS_ARM_SAU

soc/st/stm32/stm32mp2x/Kconfig.defconfig

@@ -0,0 +1,10 @@
+# STMicroelectronics STM32MP2 MPU series
+#
+# Copyright (C) 2025 Savoir-faire Linux, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_SERIES_STM32MP2X
+
+rsource "Kconfig.defconfig.stm32mp2*"
+
+endif # SOC_SERIES_STM32MP2X

soc/st/stm32/stm32mp2x/Kconfig.defconfig.stm32mp257fxx

@@ -0,0 +1,11 @@
+# STMicroelectronics STM32MP2 MPU series
+#
+# Copyright (C) 2025 Savoir-faire Linux, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_STM32MP2X_M33
+
+config NUM_IRQS
+	default 320
+
+endif # SOC_STM32MP2X_M33

soc/st/stm32/stm32mp2x/Kconfig.soc

@@ -0,0 +1,18 @@
+# STMicroelectronics STM32MP2 MPU series
+#
+# Copyright (C) 2025 Savoir-faire Linux, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+config SOC_SERIES_STM32MP2X
+	bool
+	select SOC_FAMILY_STM32
+
+config SOC_SERIES
+	default "stm32mp2x" if SOC_SERIES_STM32MP2X
+
+config SOC_STM32MP2X_M33
+	bool
+	select SOC_SERIES_STM32MP2X
+
+config SOC
+	default "stm32mp257fxx" if SOC_STM32MP2X_M33

soc/st/stm32/stm32mp2x/m33/CMakeLists.txt

@@ -0,0 +1,7 @@
+# Copyright (C) 2025 Savoir-faire Linux, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_include_directories(${ZEPHYR_BASE}/drivers)
+
+zephyr_include_directories(.)

soc/st/stm32/stm32mp2x/m33/soc.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2025 Savoir-faire Linux, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file SoC configuration macros for the STM32MP2 family processors.
+ *
+ * Based on reference manual:
+ *   STM32MP23/25xx advanced ARM(r)-based 32/64-bit MPUs
+ *
+ * Chapter 2.4.2: Memory map and register boundary addresses
+ */
+
+#ifndef _STM32MP2_M33_SOC_H_
+#define _STM32MP2_M33_SOC_H_
+
+#ifndef _ASMLANGUAGE
+
+#include <stm32mp2xx.h>
+
+#endif /* !_ASMLANGUAGE */
+
+#endif /* !_STM32MP2_M33_SOC_H_ */