drivers: spi: Add xmc4xxx driver

Adds spi driver for xmc4xxx SoCs.

Signed-off-by: Andriy Gelman <[email protected]>

Author: talih0

boards/arm/xmc45_relax_kit/doc/index.rst

@@ -43,6 +43,8 @@ The Relax Kit development board configuration supports the following hardware fe
 +-----------+------------+-----------------------+
 | UART      | on-chip    | serial port           |
 +-----------+------------+-----------------------+
+| SPI       | on-chip    | spi                   |
++-----------+------------+-----------------------+
 
 More details about the supported peripherals are available in `XMC4500 TRM`_
 Other hardware features are not currently supported by the Zephyr kernel.

drivers/spi/CMakeLists.txt

@@ -34,6 +34,7 @@ zephyr_library_sources_ifdef(CONFIG_SPI_MCHP_QSPI	spi_mchp_mss_qspi.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_PL022		spi_pl022.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_ANDES_ATCSPI200	spi_andes_atcspi200.c)
 zephyr_library_sources_ifdef(CONFIG_NXP_S32_SPI spi_nxp_s32.c)
+zephyr_library_sources_ifdef(CONFIG_SPI_XMC4XXX     spi_xmc4xxx.c)
 
 zephyr_library_sources_ifdef(CONFIG_SPI_ASYNC spi_signal.c)
 zephyr_library_sources_ifdef(CONFIG_USERSPACE		spi_handlers.c)

drivers/spi/Kconfig

@@ -107,4 +107,6 @@ source "drivers/spi/Kconfig.andes_atcspi200"
 
 source "drivers/spi/Kconfig.nxp_s32"
 
+source "drivers/spi/Kconfig.xmc4xxx"
+
 endif # SPI

drivers/spi/Kconfig.xmc4xxx

@@ -0,0 +1,20 @@
+# Copyright (c) 2022 Schlumberger
+# SPDX-License-Identifier: Apache-2.0
+
+menuconfig SPI_XMC4XXX
+	bool "XMC4XX SPI driver"
+	default y
+	depends on DT_HAS_INFINEON_XMC4XXX_SPI_ENABLED
+	select GPIO
+	help
+	  Enable XMC4XXX SPI driver.
+
+
+if SPI_XMC4XXX
+
+config SPI_XMC4XXX_INTERRUPT
+	bool "XMC4XXX SPI interrupt mode"
+	help
+	  Enables interrupt support for XMC4XXX SPI driver.
+
+endif # SPI_XMC4XXX