CONFIG_ARCH_LAN969X is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64
default or selected kernelversion does not have config value CONFIG_ARCH_LAN969X.
Result is shown for kernelversion 6.18-rc3

Microchip LAN969X SoC family

configname: CONFIG_ARCH_LAN969X

Linux Kernel Configuration
└─>Platform selection
└─>Microchip SoC support
└─>Microchip LAN969X SoC family
This enables support for the Microchip LAN969X ARMv8-based
SoC family of TSN-capable gigabit switches.

The LAN969X Ethernet switch family provides a rich set of
switching features such as advanced TCAM-based VLAN and QoS
processing enabling delivery of differentiated services, and
security through TCAM-based frame processing using versatile
content aware processor (VCAP).