mtd: rpc: Add Renesas RPC Hyperflash driver

Add driver for the RPC block in Hyperflash mode. This driver allows
access to a CFI Hyperflash attached to the RPC block and does not
support RPC in SPI mode.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index 1957980..707359d 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -40,6 +40,13 @@
 	  This enables access to Microchip PIC32 internal non-CFI flash
 	  chips through PIC32 Non-Volatile-Memory Controller.
 
+config RENESAS_RPC_HF
+	bool "Renesas RCar Gen3 RPC Hyperflash driver"
+	depends on RCAR_GEN3 && MTD
+	help
+	  This enables access to Hyperflash memory through the Renesas
+	  RCar Gen3 RPC controller.
+
 endmenu
 
 source "drivers/mtd/nand/Kconfig"