* ARM SBSA defined generic UART
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This UART uses a subset of the PL011 registers and consequently lives
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in the PL011 driver. It's baudrate and other communication parameters
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cannot be adjusted at runtime, so it lacks a clock specifier here.
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Required properties:
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- compatible: must be "arm,sbsa-uart"
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- reg: exactly one register range
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- interrupts: exactly one interrupt specifier
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- current-speed: the (fixed) baud rate set by the firmware
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