The only cases in which I know I removed reverse-engineered lists of registers were cases in which they had been copied literally (through mmio dumps) from non-Free drivers, and included without permission from the copyright holder.
I try really hard to tell code from data. It isn't always easy, and sometimes the developers don't supply enough information to tell one case from the other. In such cases, I often take a conservative approach, in the hope that someone with the device will be able to dig out the info and let me know that the bits are fine to include. I remember some such case regarding rtl8187 drivers, maybe 1.5 year ago or so. Those bits were later determined to be non-software, and thus perfectly fine.
If you know of any other examples, I'd be delighted to mark them as false positives. Please let us know at firstname.lastname@example.org. Thanks!