# lspci -t
-[0000:00]-+-00.0
           +-01.0-[01]--+-00.0
           |            \-00.1
           +-02.0
           +-16.0
           +-1a.0
           +-1b.0
           +-1c.0-[02]----00.0
           +-1c.5-[03]----00.0
           +-1c.6-[04]----00.0
           +-1c.7-[05-06]----00.0-[06]--
           +-1d.0
           +-1f.0
           +-1f.2
           \-1f.3