1* ARM AMBA Primecell PL011 & PL010 serial UART
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3Required properties:
4- compatible: must be "arm,primecell", "arm,pl011" or "arm,pl010"
5- reg: exactly one register range with length 0x1000
6- clock: input clock frequency for the UART (used to calculate the baud
7  rate divisor)
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