I am sure somewhere in the dim and distant past I was able to use modprobe and udev to associate a pci device with an existing driver. I have forgotten how.

I have a parallel port pci card. I want to associate it with the standard parport_pc driver, and the base address and irq parameters of the parport_pc driver.

I can use a modprobe alias to handle the parameters.

e.g.
alias parport_low_level parport_pc_addr
options parport_pc base_addr=0x999 irq=14

But that means I have manually load the driver.

I think I once used a udev rule for this. But I cannot remember how I did it. Maybe run modprobe from udev.

Anyone get any hints on how to go about it?

parport_pc driver can handle PCI- & PCIe-parallelport cards if kernel is compiled with (code taken from .config for 5.15.13):
Hint: CONFIG_PARPORT_1284=y is only required if IEEE1284 devices e. g. many printers shall be connected to parallelport.

PCI- & PCIe-parallelport cards are configured by PnP. They get available addresses and IRQs. Why do you want to overwrite these ressources? PCI- & PCIe-parallelport cards cannot use addresses, IRQs and DMAs known for native parallelports e.g.:

• LPT1 with I/O-base = 0x378; IRQ = 7; DMA = 3
• LPT2 with I/O-base = 0x278; IRQ = 5; DMA = 1

ECP may not work properly because any DMA cannot assigned to PCI- & PCIe-parallelport cards neither by PnP nor manually.

My PCI card is is not in the MODULE_ALIAS definitions of the parport_pc module.
I would need to recompile it to put it in.

It uses a non standard io port base address.

I need to drive it as a ppd device not as a printer device.

My modprobe alias trick appears to work and the /proc/sys/dev parport tree as properly populated.

Do you know what kernel version the parport_pc pci support appears in?

What do you mean with "non standard io port base address"?
0x378, 0x278 and 0x3bc are used by parallel ports connected to ISA- or XT-bus only. I don't now anything about "standard I/O-base address" for PCI and PCIe x1 parallel port cards. PnP assigns ressources to these cards.
Here is dmesg output related to PCIe x1 parallel port card "Dawicontrol DC-9110 PCIe" (Chip: Oxford Semiconductor OXPCIe952 Parallel Port):
No.
I'm using both PCI and PCIe x1 parallel port cards since kernel 4.19.

I have this working now using the modprobe alias described in my initial post, and a UDEV rule to run modprobe on the aliased driver name.