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+NVIDIA Tegra 30 IOMMU H/W, SMMU (System Memory Management Unit)
+
+Required properties:
+- compatible : "nvidia,tegra30-smmu"
+- reg : Should contain 3 register banks(address and length) for each
+  of the SMMU register blocks.
+- interrupts : Should contain MC General interrupt.
+- nvidia,#asids : # of ASIDs
+- dma-window : IOVA start address and length.
+- nvidia,ahb : phandle to the ahb bus connected to SMMU.
+
+Example:
+        smmu {
+                compatible = "nvidia,tegra30-smmu";
+                reg = <0x7000f010 0x02c
+                       0x7000f1f0 0x010
+                       0x7000f228 0x05c>;
+                nvidia,#asids = <4>;            /* # of ASIDs */
+                dma-window = <0 0x40000000>;    /* IOVA start & length */
+                nvidia,ahb = <&ahb>;
+        };