u-boot-brain/doc/device-tree-bindings/serial/qca,ar9330-uart.txt

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* Qualcomm Atheros AR9330 High-Speed UART
Required properties:
- compatible: Must be "qca,ar9330-uart"
- reg: Specifies the physical base address of the controller and
the length of the memory mapped region.
Additional requirements:
Each UART port must have an alias correctly numbered in "aliases"
node.
Example:
aliases {
serial0 = &uart0;
};
uart0: uart@18020000 {
compatible = "qca,ar9330-uart";
reg = <0x18020000 0x14>;
};