Renesas RPC-IF driver

modulename: renesas-rpc-if.ko

configname: CONFIG_RENESAS_RPCIF

Linux Kernel Configuration
└─>Device Drivers
└─>Memory Controller drivers
└─>Renesas RPC-IF driver
In linux kernel since version 5.1 (release Date: 2019-05-05)  
This supports Renesas R-Car Gen3 or RZ/G2 RPC-IF which provides
either SPI host or HyperFlash. You'll have to select individual
components under the corresponding menu.

source code: