I don't think the issue of SLOT_DESCRIPTION for sub-devices has ever come up before, at least I haven't heard it discussed. If the Sub-Device is patchable, I guess it would have to be relative to the sub-dev's starting address, so a 1 slot sub-dev would always have an offset of zero.
If the sub-devices aren't independantly patchable, then I think the SLOT_DESCRIPTION should be supported on the Root device, and not the sub-dev.
(I should make it clear that everything I post here is my personal opinion. My posts in no way represent an official viewpoint).
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