u-boot/doc/device-tree-bindings/serial/bcm2835-aux-uart.txt

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* BCM283x mini UART
Required properties:
- compatible: must be "brcm,bcm2835-aux-uart"
- reg: exactly one register range with length 0x1000
- clock: input clock frequency for the UART (used to calculate the baud
rate divisor)
Optional properties:
- skip-init: if present, the baud rate divisor is not changed