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

SPI driver for Microchip MEC5 HAL based QSPI controller. QSPI
hardware supports full duplex, dual, and quad operation. MEC5
QSPI controller also includes three local DMA channels per
direction to off load firmware. The driver API supports full
or half-duplex. Due to QSPI hardware not supporting one wire
half-duplex, this driver supports full-duplex only. QSPI hardware
design requires it to control chip select and current hardware
supports up to two chip selects. Zephyr's SPI DT macros store the
child SPI device's reg properity as the "slave" member of the SPI
configuration structure. The driver uses the "slave" value as the
chip select. Additional timing settings specific to SPI flash devices
are in a new SPI device YAM file: "microchip,mec5-qspi-device.yaml"
which includes the standard "spi-device.yaml". If the new YAML is not
used, the QSPI controller will use default timing values for chip
select and I/O line taps.

Signed-off-by: Scott Worley <scott.worley@microchip.com>

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

@@ -115,6 +115,7 @@ source "drivers/spi/Kconfig.mcux_dspi"
 source "drivers/spi/Kconfig.mcux_ecspi"
 source "drivers/spi/Kconfig.mcux_flexcomm"
 source "drivers/spi/Kconfig.mcux_flexio"
+source "drivers/spi/Kconfig.mec5"
 source "drivers/spi/Kconfig.npcx"
 source "drivers/spi/Kconfig.nrfx"
 source "drivers/spi/Kconfig.numaker"

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.