drivers: flash: Add MCUX C40 flash controller driver

Add flash controller driver for the on-chip C40 flash controller
The driver is backed by the MCUX C40 HAL and implements
read/erase/program, page layout, and an optional protection policy
that can lock well-known regions (IVT/MCUboot) derived from devicetree.

Key details:
- Selects FLASH_HAS_DRIVER_ENABLED / FLASH_HAS_EXPLICIT_ERASE /
FLASH_HAS_PAGE_LAYOUT.
- Runs erase/program from SRAM when XIP by relocating both the shim and
the MCUX HAL source if CODE_DATA_RELOCATION_SRAM=y.
- Optional protection pass at init (FLASH_MCUX_C40_APPLY_PROTECTION),
which aligns windows to sector boundaries and applies lock/unlock
using the HAL. This is useful on XIP systems to keep IVT/bootloader
ranges read-only; can be disabled if a bootloader or security policy
manages protection instead.

Files:
- drivers/flash/flash_mcux_c40.c (new)
- drivers/flash/CMakeLists.txt (+zephyr_code_relocate when needed,
Compliance fixes)
- drivers/flash/Kconfig.mcux (enable flash driver, reloc & protection)
- modules/hal_nxp/mcux/mcux-sdk-ng/drivers/drivers.cmake

Signed-off-by: Sumit Batra <sumit.batra@nxp.com>

Author: sumitbatra-nxp

drivers/flash/CMakeLists.txt

@@ -184,6 +184,17 @@ if(CONFIG_FLASH_NXP_S32_QSPI_NOR OR CONFIG_FLASH_NXP_S32_QSPI_HYPERFLASH)
   zephyr_library_include_directories(${ZEPHYR_BASE}/drivers/memc)
 endif()
 
+zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_MCUX_C40 flash_mcux_c40.c)
+
+if(CONFIG_SOC_FLASH_MCUX_C40 AND CONFIG_CODE_DATA_RELOCATION)
+  # Relocate the Zephyr driver to RAM when relocation is enabled
+  zephyr_code_relocate(FILES ${CMAKE_CURRENT_LIST_DIR}/flash_mcux_c40.c LOCATION RAM)
+  if(DEFINED ZEPHYR_HAL_NXP_MODULE_DIR)
+    # Relocate the HAL driver to RAM
+    zephyr_code_relocate(FILES ${ZEPHYR_HAL_NXP_MODULE_DIR}/mcux/mcux-sdk-ng/drivers/flash_c40/fsl_c40_flash.c LOCATION RAM)
+  endif()
+endif()
+
 if(CONFIG_SOC_FLASH_RENESAS_RA_HP)
   zephyr_library_sources(soc_flash_renesas_ra_hp.c)
   zephyr_library_sources_ifdef(CONFIG_FLASH_EX_OP_ENABLED soc_flash_renesas_ra_hp_ex_op.c)

drivers/flash/Kconfig.mcux

@@ -130,3 +130,31 @@ config FLASH_MCUX_XSPI
 	select FLASH_HAS_EXPLICIT_ERASE
 	help
 	  Enable the mcux xspi flash driver.
+
+# MCUX C40 internal flash driver
+config SOC_FLASH_MCUX_C40
+	bool "MCUX C40 flash driver"
+	default y
+	depends on DT_HAS_NXP_C40_FLASH_CONTROLLER_ENABLED
+	depends on DT_HAS_NXP_C40_FLASH_ENABLED
+	select FLASH_HAS_DRIVER_ENABLED
+	select FLASH_HAS_EXPLICIT_ERASE
+	select FLASH_HAS_PAGE_LAYOUT
+	# C40 uses controller commands, not CPU stores to flash
+	# so we are not relaxing MPU for ROM writes.
+	# Relocate driver/HAL when XIP so erase/program run from SRAM:
+	imply CODE_DATA_RELOCATION if XIP
+	imply CODE_DATA_RELOCATION_SRAM if XIP
+	help
+	  Enable the NXP MCUX C40 internal flash driver
+	  Provides Zephyr flash driver using MCUX C40 HAL.
+
+config SOC_FLASH_MCUX_C40_APPLY_PROTECTION
+	bool "Apply default protection windows (IVT/MCUboot) at init"
+	depends on SOC_FLASH_MCUX_C40
+	default y if XIP
+	help
+	  When enabled, the driver locks/unlocks protection for well-known
+	  regions derived from devicetree (e.g. ivt_header, ivt_pad, mcuboot)
+	  during driver init. Useful on XIP systems to keep IVT/bootloader
+	  areas read-only. Disable if your bootloader/policy manages this.