default or selected kernelversion does not have config value CONFIG_SPI_TXX9.
Result is shown for kernelversion 6.9.9

Toshiba TXx9 SPI controller

modulename: spi-txx9.ko

configname: CONFIG_SPI_TXX9

Linux Kernel Configuration
└─>Device Drivers
└─>SPI support
└─>Toshiba TXx9 SPI controller
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
SPI driver for Toshiba TXx9 MIPS SoCs

source code:
drivers/spi/spi-txx9.c