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media: v4l2-core: add v4l2_debugfs_root()

Mauro Carvalho Chehab requested to merge linux-media/users/mchehab:tmp_hverkuil_cec into next

This new function returns the dentry of the top-level debugfs "v4l2" directory. If it does not exist yet, then it is created first.

Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org

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