driver: flash: add flash driver for rts5912

add flash driver for rts5912.

Signed-off-by: Jhan BoChao <jhan_bo_chao@realtek.com>

Author: JhanBoChao-Realtek

drivers/flash/CMakeLists.txt

@@ -57,6 +57,7 @@ zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_NRF_MRAM soc_flash_nrf_mram.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_NRF_RRAM soc_flash_nrf_rram.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_NUMAKER soc_flash_numaker.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_NUMAKER_RMC soc_flash_numaker_rmc.c)
+zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_RTS5912 flash_realtek_rts5912.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_RV32M1 soc_flash_rv32m1.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_SAM flash_sam.c)
 zephyr_library_sources_ifdef(CONFIG_SOC_FLASH_SAM0 flash_sam0.c)

drivers/flash/Kconfig

@@ -193,6 +193,7 @@ source "drivers/flash/Kconfig.numaker_rmc"
 source "drivers/flash/Kconfig.nxp_s32"
 source "drivers/flash/Kconfig.renesas_ra"
 source "drivers/flash/Kconfig.rpi_pico"
+source "drivers/flash/Kconfig.rts5912"
 source "drivers/flash/Kconfig.rv32m1"
 source "drivers/flash/Kconfig.sam"
 source "drivers/flash/Kconfig.sam0"

drivers/flash/Kconfig.rts5912

@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright (c) 2025 Realtek Semiconductor Corporation, SIBG-SD7
+#
+
+config SOC_FLASH_RTS5912
+	bool "Realtek RTS5912 flash driver"
+	default y
+	depends on DT_HAS_REALTEK_RTS5912_FLASH_CONTROLLER_ENABLED
+	select FLASH_HAS_PAGE_LAYOUT
+	select FLASH_HAS_DRIVER_ENABLED
+	select FLASH_HAS_EXPLICIT_ERASE
+	select FLASH_HAS_EX_OP
+	select HAS_FLASH_LOAD_OFFSET
+	help
+	  The flash driver includes support for read, write and
+	  erase flash operations. It also supports protection.
+	  The rts5912 flash size is 960K byte.