[new driver] [request] Port rtsx from OpenBSD to FreeBSD

Hi, in my quest to make FreeBSD fully operational in my laptop, I would like to know whether anyone is working on porting the OpenBSD rtsx to FreeBSD. I have asked to Robert (https://lists.freebsd.org/pipermail/freebsd-questions/2015-February/264014.html) about its working on the module but he has not yet got the chance to start it. If not, I'd try to develop it personally, but I have to be sure the better workflow: is it better to integrate it with sdhci/mmc modules or start it brand new? Thanks, Simone