Documentation/devicetree/bindings/arm/armada-39x.txt

Marvell Armada 39x Platforms Device Tree Bindings
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Boards with a SoC of the Marvell Armada 39x family shall have the
following property:

Required root node property:

 - compatible: must contain "marvell,armada390"

In addition, boards using the Marvell Armada 398 SoC shall have the
following property before the previous one:

Required root node property:

compatible: must contain "marvell,armada398"

Example:

compatible = "marvell,a398-db", "marvell,armada398", "marvell,armada390";