Merge "arm64: tegra: Enable GM20B GPU on Tegra210" from Thierry Reding:
Complement the GM20B GPU device tree node on Tegra210 with missing
properties to make it usable.
* tag 'tegra-for-4.7-gm20b' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
arm64: tegra: Add IOMMU node to GM20B on Tegra210
arm64: tegra: Add reference clock to GM20B on Tegra210
dt-bindings: Add documentation for GM20B GPU
dt-bindings: gk20a: Document iommus property
dt-bindings: gk20a: Fix typo in compatible name