spi: axiado: Add driver for Axiado SPI DB controller

The Axiado SPI controller is present in AX3000 SoC and Evaluation Board.
This controller is operating in Host only mode.

Co-developed-by: Prasad Bolisetty <pbolisetty@axiado.com>
Signed-off-by: Prasad Bolisetty <pbolisetty@axiado.com>
Signed-off-by: Vladimir Moravcevic <vmoravcevic@axiado.com>
Link: https://patch.msgid.link/20260107-axiado-ax3000-soc-spi-db-controller-driver-v3-2-726e70cf19ad@axiado.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Vladimir Moravcevic

drivers/spi/Kconfig

@@ -204,6 +204,16 @@ config SPI_AXI_SPI_ENGINE
 	  It is part of the SPI Engine framework that is used in some Analog Devices
 	  reference designs for FPGAs.
 
+config SPI_AXIADO
+	tristate "Axiado DB-H SPI controller"
+	depends on SPI_MEM
+	help
+	  Enable support for the SPI controller present on Axiado AX3000 SoCs.
+
+	  The implementation supports host-only mode and does not provide target
+	  functionality. It is intended for use cases where the SoC acts as the SPI
+	  host, communicating with peripheral devices such as flash memory.
+
 config SPI_BCM2835
 	tristate "BCM2835 SPI controller"
 	depends on GPIOLIB

drivers/spi/Makefile

@@ -32,6 +32,7 @@ obj-$(CONFIG_SPI_AT91_USART)		+= spi-at91-usart.o
 obj-$(CONFIG_SPI_ATH79)			+= spi-ath79.o
 obj-$(CONFIG_SPI_AU1550)		+= spi-au1550.o
 obj-$(CONFIG_SPI_AXI_SPI_ENGINE)	+= spi-axi-spi-engine.o
+obj-$(CONFIG_SPI_AXIADO)		+= spi-axiado.o
 obj-$(CONFIG_SPI_BCM2835)		+= spi-bcm2835.o
 obj-$(CONFIG_SPI_BCM2835AUX)		+= spi-bcm2835aux.o
 obj-$(CONFIG_SPI_BCM63XX)		+= spi-bcm63xx.o