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Many SoCs from MediaTek have a high-speed uart. This UART is compatible with the ns16550 in legacy mode. It has extra registers for high-speed mode which can reach a maximum baudrate at 921600. However this UART will no longer be compatible if it's in high-speed mode. Some BootROM of MediaTek's SoCs will change the UART into high-speed mode and the U-Boot must use this driver to initialize the UART. Signed-off-by: Weijie Gao <weijie.gao@mediatek.com> Tested-by: Ryder Lee <ryder.lee@mediatek.com> Reviewed-by: Simon Glass <sjg@chromium.org>