8250: exar XR16M752 support question

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Hello,

What's the best PORT_XXXXX mode for XR16M752 chip of 8250 family
(64-bytes FIFO)? I failed to find exact match in the Linux sources.

It auto-detects as PORT_16654:

50000000.uart0: ttyS0 at MMIO 0x50000000 (irq = 88, base_baud = 460800) is a ST16654

but I'm not sure it's the right kind.

XR16M752 datasheet claims TL16C752B/SC16C752B compatibility.
  SC16C752 datasheet claims SC16C2550 compatibility.
    SC16C2550 datasheet claims SC16C2450 compatibility.
       SC16C2450 datasheet claims 16C450/16C550 compatibility.

-- Sergey
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