include custom kernel module in initramfs

Hi everyone,

I want to install opensuse on my MacBook 12" with full disk encryption and therefore need this module to be included into initramfs. In otherwords, so that I have the internal keyboard available, when I get asked for the disk encryption keys by grub and opensuse again.
Can someone point me to the proper guide (or tell me the file I have to add this to), so dracut includes the module properly?

I know this is probably an easy-to-solve thing but I just can’t seem to find the right search string for doing this in Tumebleweed.

Thanks for any advice!