git question - how do I get the sources that have been tagged?

[Barry Scott]

I'm after all the source of the drm 2.3.0 release.

How do I use git to get all the source that drm-2.3.0 tags?
I need the kernel drivers as well as the user land code
so the tarball is no use to me.

All the git docs tell me how to create a tag, but I have not
found a single use show how to get a tree of files that correspond
to a tag.

Barry