drivers: spi: microchip: Add SPI driver for MEC5 HAL quad SPI

SPI driver for Microchip MEC5 HAL based QSPI controller. QSPI is
capable of single, dual, and quad opertion. It includes three
local DMA channels for each direction to off load firmware. The
driver supports CONFIG_SPI_ASYNC and CONFIG_SPI_EXTENDED_MODE.
Driver buffer handling tries follows the Zephyr SPI_NOR flash
driver model. We keep finding more buffer corner cases the
zephyr tests keep adding. Example: flash common test passes
SPI RX buffer with a non-null pointer and zero length.

Signed-off-by: Scott Worley <[email protected]>

Author: scottwcpg

drivers/spi/CMakeLists.txt

@@ -37,6 +37,7 @@ zephyr_library_sources_ifdef(CONFIG_SPI_MCUX_DSPI spi_mcux_dspi.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_MCUX_ECSPI spi_mcux_ecspi.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_MCUX_FLEXCOMM spi_mcux_flexcomm.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_MCUX_FLEXIO spi_mcux_flexio.c)
+zephyr_library_sources_ifdef(CONFIG_SPI_MEC5_QSPI spi_mchp_mec5_qspi.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_NPCX_SPIP spi_npcx_spip.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_NRFX_SPI spi_nrfx_spi.c spi_nrfx_common.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_NRFX_SPIM spi_nrfx_spim.c spi_nrfx_common.c)

drivers/spi/Kconfig

@@ -144,4 +144,6 @@ source "drivers/spi/Kconfig.xmc4xxx"
 source "drivers/spi/spi_nxp_lpspi/Kconfig"
 # zephyr-keep-sorted-stop
 
+source "drivers/spi/Kconfig.mec5"
+
 endif # SPI

drivers/spi/Kconfig.mec5

@@ -0,0 +1,12 @@
+# Microchip MEC5 QSPI
+
+# Copyright (c) 2025 Microchip Technology Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+config SPI_MEC5_QSPI
+	bool "Microchip MEC5 QSPI driver"
+	default y
+	depends on DT_HAS_MICROCHIP_MEC5_QSPI_ENABLED
+	select PINCTRL
+	help
+	  Enable support for Microchip MEC5 QSPI driver.