stm32lx: spi: add SPI driver for STM32Lx family

Add a SPI master and slave driver for the L series.

Change-Id: I1faf5c97f992c91eba852fd126e7d3b83158993d
Origin: Original
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Lee Jones <lee.jones@linaro.org>

Author: superna9999

drivers/spi/Kconfig

@@ -43,6 +43,21 @@ config SPI_INTEL
 	  was formerly found on XScale chips. It can be found nowadays
 	  on CEXXXX Intel media controller and Quark CPU (2 of them).
 
+config SPI_STM32LX
+	bool
+	prompt "STM32LX MCU SPI controller driver"
+	depends on SPI && SOC_FAMILY_STM32 && SOC_SERIES_STM32L4X
+	default n
+	help
+	  Enable SPI support on the STM32Lxx family of processors.
+
+config SPI_STM32LX_INTERRUPT
+	bool
+	prompt "STM32LX MCU SPI Interrupt Support"
+	depends on SPI_STM32LX
+	default n
+	help
+	  Enable Interrupt support for the SPI Driver of STM32Lxx family.
 
 if SPI
 config SPI_INIT_PRIORITY
@@ -188,6 +203,44 @@ config SPI_2_CS_GPIO_PIN
 	depends on SPI_2 && SPI_CS_GPIO
 	default 0
 
+config SPI_3
+	bool
+	prompt "SPI port 3"
+	default n
+	help
+	  Enable SPI controller port 3.
+
+config SPI_3_NAME
+	string
+	prompt "SPI port 3 device name"
+	depends on SPI_3
+	default "SPI_3"
+
+config SPI_3_IRQ_PRI
+	int
+	prompt "Port 3 interrupt priority"
+	depends on SPI_3
+
+config SPI_3_DEFAULT_CFG
+	hex "Port 3 default configuration"
+	depends on SPI_3
+	default 0x80
+
+config SPI_3_DEFAULT_BAUD_RATE
+	int "Port 3 default baud rate"
+	depends on SPI_3
+	default 500000
+
+config SPI_3_CS_GPIO_PORT
+	string
+	prompt "The GPIO port which is used to control CS"
+	depends on SPI_3 && SPI_CS_GPIO
+	default "GPIO_0"
+
+config SPI_3_CS_GPIO_PIN
+	int "The GPIO PIN which is used to act as a CS pin"
+	depends on SPI_3 && SPI_CS_GPIO
+
 config SPI_SS_INIT_PRIORITY
 	int "Init priority"
 	depends on SPI_QMSI_SS

drivers/spi/Makefile

@@ -4,3 +4,4 @@ obj-$(CONFIG_SPI_MCUX_DSPI) += spi_mcux_dspi.o
 obj-$(CONFIG_SPIM_NRF52) += spim_nrf52.o
 obj-$(CONFIG_SPI_QMSI) += spi_qmsi.o
 obj-$(CONFIG_SPI_QMSI_SS) += spi_qmsi_ss.o
+obj-$(CONFIG_SPI_STM32LX) += spi_stm32lx.o