Moving a file back to an earlier revision.

Hi,

Another user question.  Other may actually have similar needs.

I am working on a board port on a separate branch.  The branch has
accumulated several revision of changes to a driver I worked on.  Now,
someone has come along with a better fix so I want to help test his
patch.  To do that I have to revert my changes to that driver (several
revisions back) before I can apply his patch.

What would be a convenient way to do that with git?

TIA, David
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