serial: 8250_mid: add support for DMA engine handling from UART MMIO
The platforms that have this UART, but that don't have separate PCI device for the DMA Engine, need to create the HSU DMA Engine device separately. Signed-off-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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