Submodules with feature branches

I have a question regarding submodules and their applicability given our workflow at the place I work.

When I work on a feature, I normally create a feature branch. If I happen to make changes to the submodule that only work with the changes introduced in my feature branch, that seems to complicate things. For the purposes of the feature branch, do I need to create a corresponding feature branch in the submodule and temporarily update the submodule URL to point to it? When I merge my feature branch, I'd have to swap it back?

What is a recommended workflow for this? Thanks in advance.