default or selected kernelversion does not have config value CONFIG_MCP2120_DONGLE_OLD.
Result is shown for kernelversion 5.4.123
Microchip MCP2120
modulename: mcp2120.ko
configname: CONFIG_MCP2120_DONGLE_OLD
Linux Kernel Configuration
└─>Networking support
└─>IrDA (infrared) subsystem support
└─>Infrared-port device drivers
└─>Microchip MCP2120
In linux kernel since version 2.6.12
Say Y here if you want to build support for the Microchip MCP2120
dongle. To compile it as a module, choose M here. The MCP2120 dongle
attaches to the normal 9-pin serial port connector, and can
currently only be used by IrTTY. To activate support for MCP2120
dongles you will have to insert "irattach -d mcp2120" in the
/etc/irda/drivers script.
You must build this dongle yourself. For more information see:
<http://www.eyetap.org/~tangf/irda_sir_linux.html>
dongle. To compile it as a module, choose M here. The MCP2120 dongle
attaches to the normal 9-pin serial port connector, and can
currently only be used by IrTTY. To activate support for MCP2120
dongles you will have to insert "irattach -d mcp2120" in the
/etc/irda/drivers script.
You must build this dongle yourself. For more information see:
<http://www.eyetap.org/~tangf/irda_sir_linux.html>