spi: ca_sflash: Add CAxxxx SPI Flash Controller

Add SPI Flash controller driver for Cortina Access
CAxxxx SoCs

Signed-off-by: Pengpeng Chen <pengpeng.chen@cortina-access.com>
Signed-off-by: Alex Nemirovsky <alex.nemirovsky@cortina-access.com>
CC: Vignesh R <vigneshr@ti.com>
CC: Tom Rini <trini@konsulko.com>
[jagan: rebase on master]
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index f7a9852..cd19b2d 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -106,6 +106,14 @@
 	  be used to access the SPI flash on platforms embedding this
 	  Broadcom SPI core.
 
+config CORTINA_SFLASH
+	bool "Cortina-Access Serial Flash controller driver"
+	depends on DM_SPI && SPI_MEM
+	help
+	  Enable the Cortina-Access Serial Flash controller driver. This driver
+	  can be used to access the SPI NOR/NAND flash on platforms embedding this
+	  Cortina-Access IP core.
+
 config CADENCE_QSPI
 	bool "Cadence QSPI driver"
 	help