TUSB7320 driver under linux

Robin,

It is supported in Linux in the open source community, The latest supported Linux releases of 2.6.32 onward all have xHCI support, it just needs to enabled in the kernel configuration.  Whatever is one's current source for Linux, that is where to go for the xHCI driver. Support has been there since 2.6.31 (2.6.31 is in no way recommended, xHCI support was not all robust initially).  Here are the kernel versions I recommend based on when kernel.org went offline.
      3.0.4 -- most robust
      2.6.39.4
      2.6.35.14 -- stable, will work with our host, but won't be as robust
      2.6.32.46 -- stable, will work with our host, but won't be as robust

To get the most out of TI's controller, using the newest possible kernel version is recommended. While the latest 2.6.32.x through 2.6.35.x are supported, I recommend going with a newer kernel release, preferably the latest 3.x stable release.