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serial/8250: add support for Ingenic jz47xx UART quirks
The UART block used in Ingenic SoCs is advertised as NS16550 compatible, however it isn't quite. The only difference relevant to basic usage is the presence of a 'UART module enable' bit in the FCR register which must be set at all times in order for the UART block to function. This patch introduces a new UART port type for Ingenic jz47xx UARTs which simply sets that bit. Signed-off-by: Paul Burton <firstname.lastname@example.org>
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