Renesas RPC-IF SPI driver

modulename: spi-rpc-if.ko

configname: CONFIG_SPI_RPCIF

Linux Kernel Configuration
└─>Device Drivers
└─>SPI support
└─>Renesas RPC-IF SPI driver
In linux kernel since version 5.1 (release Date: 2019-05-05)  
SPI driver for Renesas R-Car Gen3 or RZ/G2 RPC-IF.

source code:
drivers/spi/spi-rpc-if.c