Building upon their open-source graphics driver support for the Tegra K1 and their revised code for handling this Kepler GPU in the ARM world, the third revision was sent out a short time ago by Alexandre Courbot.
This third revision of the patches incorporate the feedback from upstream kernel/Nouveau developers during the first two round of patches. The revised nine patches can be found on dri-devel and will hopefully make it into the mainline tree for Linux 3.16... One of the NVIDIA developers mentioned to me that much of their Tegra K1 SoC requirements when it comes to kernel code is already lined up within linux-next.
While NVIDIA is contributing this kernel DRM code, they still obviously offer first-rate support for the Tegra K1 through their mainline NVIDIA Linux graphics driver. NVIDIA's Nouveau contributions right now are also centered around the kernel code over any work on the Nouveau Gallium3D drivers. If you haven't already, be sure to checkout our many NVIDIA Tegra K1 articles on Phoronix with being very busy now benchmarking the Jetson TK1 development board.