On Mon, Dec 15, 2014 at 6:53 PM, Michael Tessier
[off-list ref] wrote:

Before attempting to upgrade to an earlier kernel driver (this is
a fairly big amount of work), I would really like to know if this
problem would still be in the 3.x kernels. Has anyone seen that
issue in 3.x kernels?

In fact it is very simple to test USB on a 3.18 kernel with your hardware.

You only need a minimal dts file with the usb/serial nodes enabled.

Take a loot at arch/arm/boot/dts/imx51-babbage.dts for a reference.

I tested USB earlier today on this board with 3.18 and it worked fine.
You need this patch:
http://www.spinics.net/lists/arm-kernel/msg385739.html

Regards,

Fabio Estevam