[nrf fromlist] drivers: mspi: Add driver for Designware SSI based controllers

Add a generic driver for controllers based on the Designware SSI core.
With small vendor-specific adaptations covering integration details,
it should be possible to use it for many devices.

Signed-off-by: Andrzej Głąbek <[email protected]>
(cherry picked from commit aea4e024685afd5a4a42252869d6e74d0b9fcecb)

Upstream PR: zephyrproject-rtos/zephyr#80042

Author: anangl

drivers/mspi/CMakeLists.txt

@@ -4,4 +4,5 @@ zephyr_syscall_header(${ZEPHYR_BASE}/include/zephyr/drivers/mspi.h)
 
 zephyr_library()
 zephyr_library_sources_ifdef(CONFIG_MSPI_AMBIQ_AP3   mspi_ambiq_ap3.c)
+zephyr_library_sources_ifdef(CONFIG_MSPI_DW          mspi_dw.c)
 zephyr_library_sources_ifdef(CONFIG_MSPI_EMUL        mspi_emul.c)

drivers/mspi/Kconfig

@@ -60,6 +60,7 @@ module-str = mspi
 source "subsys/logging/Kconfig.template.log_config"
 
 source "drivers/mspi/Kconfig.ambiq"
+source "drivers/mspi/Kconfig.dw"
 source "drivers/mspi/Kconfig.mspi_emul"
 
 endif # MSPI

drivers/mspi/Kconfig.dw

@@ -0,0 +1,7 @@
+# Copyright (c) 2024 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+config MSPI_DW
+	bool "DesignWare SSI controller driver"
+	default y
+	depends on DT_HAS_SNPS_DESIGNWARE_SSI_ENABLED