kernel_samsung_msm8974/Documentation/devicetree/bindings/arm/tegra.txt

NVIDIA Tegra device tree bindings
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Boards with the tegra20 SoC shall have the following properties:

Required root node property:

compatible = "nvidia,tegra20";

Boards with the tegra30 SoC shall have the following properties:

Required root node property:

compatible = "nvidia,tegra30";