Pali Rohár 016e2be96d
serial: Implement flush callback ...
UART drivers have putc/puts functions which just put characters into HW
transmit queue and do not wait until all data are transmitted.
Implement flush callback via serial driver's pending(false) callback which
waits until HW transmit all characters from the queue.
Signed-off-by: Pali Rohár <pali@kernel.org >
Reviewed-by: Simon Glass <sjg@chromium.org >
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