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NVIDIA Tegra AHB

Required properties:
- compatible : For Tegra20, must contain "nvidia,tegra20-ahb".  For
  Tegra30, must contain "nvidia,tegra30-ahb".  Otherwise, must contain
  '"nvidia,<chip>-ahb", "nvidia,tegra30-ahb"' where <chip> is tegra124,
  tegra132, or tegra210.
- reg : Should contain 1 register ranges(address and length).  For
  Tegra20, Tegra30, and Tegra114 chips, the value must be <0x6000c004
  0x10c>.  For Tegra124, Tegra132 and Tegra210 chips, the value should
  be be <0x6000c000 0x150>.

Example (for a Tegra20 chip):
	ahb: ahb@6000c004 {
		compatible = "nvidia,tegra20-ahb";
		reg = <0x6000c004 0x10c>; /* AHB Arbitration + Gizmo Controller */
	};