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Add support for dmaengine API. The drivers can implement the struct uart_8250_dma member in struct uart_8250_port and 8250.c can take care of the rest. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>