default or selected kernelversion does not have config value CONFIG_IRPORT_SIR.
Result is shown for kernelversion 5.4.123
IrPORT (IrDA serial driver)
modulename: irport.ko
configname: CONFIG_IRPORT_SIR
Linux Kernel Configuration
└─>Networking support
└─>IrDA (infrared) subsystem support
└─>Infrared-port device drivers
└─>IrPORT (IrDA serial driver)
In linux kernel since version 2.6.12
Say Y here if you want to build support for the IrPORT IrDA device
driver. To compile it as a module, choose M here: the module will be
called irport. IrPORT can be used instead of IrTTY and sometimes
this can be better. One example is if your IrDA port does not
have echo-canceling, which will work OK with IrPORT since this
driver is working in half-duplex mode only. You don't need to use
irattach with IrPORT, but you just insert it the same way as FIR
drivers (insmod irport io=0x3e8 irq=11). Notice that IrPORT is a
SIR device driver which means that speed is limited to 115200 bps.
If unsure, say Y.
driver. To compile it as a module, choose M here: the module will be
called irport. IrPORT can be used instead of IrTTY and sometimes
this can be better. One example is if your IrDA port does not
have echo-canceling, which will work OK with IrPORT since this
driver is working in half-duplex mode only. You don't need to use
irattach with IrPORT, but you just insert it the same way as FIR
drivers (insmod irport io=0x3e8 irq=11). Notice that IrPORT is a
SIR device driver which means that speed is limited to 115200 bps.
If unsure, say Y.