diff --git a/drivers/mtd/spi/Kconfig b/drivers/mtd/spi/Kconfig
index fd2d7ac..ac6d09f 100644
--- a/drivers/mtd/spi/Kconfig
+++ b/drivers/mtd/spi/Kconfig
@@ -12,3 +12,13 @@
 	  during the transition parent. SPI and SPI flash must be
 	  enabled together (it is not possible to use driver model
 	  for one and not the other).
+
+config SPI_FLASH_SANDBOX
+	bool "Support sandbox SPI flash device"
+	depends on SANDBOX && DM_SPI_FLASH
+	help
+	  Since sandbox cannot access real devices, an emulation mechanism is
+	  provided instead. Drivers can be connected up to the sandbox SPI
+	  bus (see CONFIG_SANDBOX_SPI) and SPI traffic will be routed to this
+	  device. Typically the contents of the emulated SPI flash device is
+	  stored in a file on the host filesystem.