serial: MediaTek: add high-speed uart driver for MediaTek SoCs
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.
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index a48458f..b6377b1 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -67,6 +67,7 @@
obj-$(CONFIG_NULLDEV_SERIAL) += serial_nulldev.o
obj-$(CONFIG_OWL_SERIAL) += serial_owl.o
obj-$(CONFIG_OMAP_SERIAL) += serial_omap.o
+obj-$(CONFIG_MTK_SERIAL) += serial_mtk.o
ifndef CONFIG_SPL_BUILD
obj-$(CONFIG_USB_TTY) += usbtty.o