x86: apl: Add UART driver
Add a driver for the Apollo Lake UART. It uses the standard ns16550 device but also sets up the input clock with LPSS and supports configuration via of-platdata. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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arch/x86/cpu/apollolake/uart.c
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