soc: silabs: Add Kconfig and CMake files

Add Kconfig and CMake files to enable build system to pick up
Kconfig.defconfig and CMakeLists.txt.

Signed-off-by: Aksel Skauge Mellbye <[email protected]>

Author: asmellby

soc/CMakeLists.txt

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2025 Silicon Laboratories Inc.
+
+add_subdirectory(silabs)

soc/silabs/CMakeLists.txt

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2025 Silicon Laboratories Inc.
+
+add_subdirectory_ifdef(CONFIG_SOC_FAMILY_SILABS_S2 silabs_s2)

soc/silabs/Kconfig.defconfig

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2025 Silicon Laboratories Inc.
+
+rsource "*/Kconfig.defconfig"

soc/silabs/Kconfig.soc

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2025 Silicon Laboratories Inc.

soc/silabs/silabs_s2/CMakeLists.txt

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2025 Silicon Laboratories Inc.

soc/silabs/silabs_s2/Kconfig.defconfig

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2025 Silicon Laboratories Inc.

soc/silabs/soc.yml

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2025 Silicon Laboratories Inc.
+
+# soc.yml needs to declare at least one SoC to register as a SoC root in list_hardware.py and make
+# this path get picked up by Kconfig.soc and Kconfig.defconfig
+socs:
+  - extend: efr32mg24b310f1536im48