linux/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
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   1NVIDIA Tegra 30 IOMMU H/W, SMMU (System Memory Management Unit)
   2
   3Required properties:
   4- compatible : "nvidia,tegra30-smmu"
   5- reg : Should contain 3 register banks(address and length) for each
   6  of the SMMU register blocks.
   7- interrupts : Should contain MC General interrupt.
   8- nvidia,#asids : # of ASIDs
   9- dma-window : IOVA start address and length.
  10- nvidia,ahb : phandle to the ahb bus connected to SMMU.
  11
  12Example:
  13        smmu {
  14                compatible = "nvidia,tegra30-smmu";
  15                reg = <0x7000f010 0x02c
  16                       0x7000f1f0 0x010
  17                       0x7000f228 0x05c>;
  18                nvidia,#asids = <4>;            /* # of ASIDs */
  19                dma-window = <0 0x40000000>;    /* IOVA start & length */
  20                nvidia,ahb = <&ahb>;
  21        };
  22