driver: misc: introduce silabs siwx91x network coprocessor driver

Actually, no driver is linked to the nwp (network coprocessor) device,
which didn't allow us to check on a successful initialization for all
the other options that depends on it (WiFi, BT, Power Management,...).
This patch allows to declare the nwp as a device and to link all the
ressources that the nwp needs to work properly (stack, irq, ...).

Signed-off-by: Martin Hoff <[email protected]>

Author: Martinhoff-maker

drivers/misc/CMakeLists.txt

@@ -13,6 +13,7 @@ add_subdirectory_ifdef(CONFIG_MCUX_FLEXIO mcux_flexio)
 add_subdirectory_ifdef(CONFIG_RENESAS_RA_EXTERNAL_INTERRUPT renesas_ra_external_interrupt)
 add_subdirectory_ifdef(CONFIG_RENESAS_RX_EXTERNAL_INTERRUPT renesas_rx_external_interrupt)
 add_subdirectory_ifdef(CONFIG_NXP_RTXXX_DSP_CTRL nxp_rtxxx_dsp_ctrl)
+add_subdirectory_ifdef(CONFIG_SILABS_SIWX91X_NWP silabs_siwx91x_nwp)
 add_subdirectory_ifdef(CONFIG_STM32N6_AXISRAM stm32n6_axisram)
 
 add_subdirectory(interconn)

drivers/misc/Kconfig

@@ -19,6 +19,7 @@ source "drivers/misc/interconn/Kconfig"
 source "drivers/misc/renesas_ra_external_interrupt/Kconfig"
 source "drivers/misc/renesas_rx_external_interrupt/Kconfig"
 source "drivers/misc/nxp_rtxxx_dsp_ctrl/Kconfig"
+source "drivers/misc/silabs_siwx91x_nwp/Kconfig"
 source "drivers/misc/stm32n6_axisram/Kconfig"
 source "drivers/misc/nxp_inputmux/Kconfig"
 

drivers/misc/silabs_siwx91x_nwp/CMakeLists.txt

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+
+zephyr_include_directories(.)
+
+zephyr_library_sources_ifdef(CONFIG_SILABS_SIWX91X_NWP siwx91x_nwp.c)

drivers/misc/silabs_siwx91x_nwp/Kconfig

@@ -0,0 +1,28 @@
+# Copyright (c) 2025 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+config SILABS_SIWX91X_NWP
+	bool "Silabs Network Coprocessor"
+	depends on DT_HAS_SILABS_SIWX91X_NWP_ENABLED
+	select POLL
+	select DYNAMIC_THREAD
+	select THREAD_NAME
+	select THREAD_STACK_INFO
+	select THREAD_MONITOR
+	select INIT_STACKS
+	select CMSIS_RTOS_V2
+	help
+	  Add support for Network Coprocessor (also named NWP) presents on SiWx91x parts.
+
+if SILABS_SIWX91X_NWP
+
+config CMSIS_V2_THREAD_DYNAMIC_MAX_COUNT
+	default 2
+
+config CMSIS_V2_THREAD_DYNAMIC_STACK_SIZE
+	default 1024
+
+config CMSIS_V2_THREAD_MAX_STACK_SIZE
+	default 2048
+
+endif