default or selected kernelversion does not have config value CONFIG_AD5930.
Result is shown for kernelversion 6.5.1

Analog Devices ad5930/5932 driver

modulename: ad5930.ko

configname: CONFIG_AD5930

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>IIO staging drivers
└─>Direct Digital Synthesis
└─>SPI support
└─>Analog Devices ad5930/5932 driver
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
Say yes here to build support for Analog Devices DDS chip
ad5930/ad5932, provides direct access via sysfs.

source code: