tty: serial: Add driver for MEN's 16z135 High Speed UART.
Add driver for MEN's 16z135 High Speed UART. The 16z135 is a memory mapped UART Core on an MCB FPGA and has 1024 byte deep FIFO buffers for the RX and TX path. It also has configurable FIFO fill level IRQs and data copied to and from the hardware has to be acknowledged. Signed-off-by: Johannes Thumshirn <johannes.thumshirn@men.de> Reviewed-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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