spi: stm32: Add OSPI driver

Add STM32 OSPI driver, it supports :
  - support sNOR / sNAND devices.
  - Three functional modes: indirect, automatic-status polling,
    memory-mapped.
  - Single-, dual-, quad-, and octal-SPI communication.
  - Dual-quad communication.
  - Single data rate (SDR).
  - DMA channel for indirect mode.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Link: https://patch.msgid.link/20250219080059.367045-3-patrice.chotard@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Patrice Chotard

drivers/spi/Kconfig

@@ -1045,6 +1045,16 @@ config SPI_STM32
 	  is not available, the driver automatically falls back to
 	  PIO mode.
 
+config SPI_STM32_OSPI
+	tristate "STMicroelectronics STM32 OCTO SPI controller"
+	depends on ARCH_STM32 || COMPILE_TEST
+	depends on OF
+	depends on SPI_MEM
+	help
+	  This enables support for the Octo SPI controller in master mode.
+	  This driver does not support generic SPI. The implementation only
+	  supports spi-mem interface.
+
 config SPI_STM32_QSPI
 	tristate "STMicroelectronics STM32 QUAD SPI controller"
 	depends on ARCH_STM32 || COMPILE_TEST

drivers/spi/Makefile

@@ -137,6 +137,7 @@ obj-$(CONFIG_SPI_SN_F_OSPI)		+= spi-sn-f-ospi.o
 obj-$(CONFIG_SPI_SPRD)			+= spi-sprd.o
 obj-$(CONFIG_SPI_SPRD_ADI)		+= spi-sprd-adi.o
 obj-$(CONFIG_SPI_STM32) 		+= spi-stm32.o
+obj-$(CONFIG_SPI_STM32_OSPI) 		+= spi-stm32-ospi.o
 obj-$(CONFIG_SPI_STM32_QSPI) 		+= spi-stm32-qspi.o
 obj-$(CONFIG_SPI_ST_SSC4)		+= spi-st-ssc4.o
 obj-$(CONFIG_SPI_SUN4I)			+= spi-sun4i.o