In Mediatek SOCs, the uart can support DMA function.
Base on DMA engine formwork, we add the DMA code to support uart. And put the code under drivers/dma.

This series contains document bindings, Kconfig to control the function enable or not,
device tree including interrupt and dma device node, the code of UART DM

Changes compared to v1:
-mian revised file, 8250_mtk_dma.c
--parameters renamed for standard
--remove atomic operation

Long Cheng (4):
  dt-bindings: dma: uart: add uart dma bindings
  dmaengine: mtk_uart_dma: add Mediatek uart DMA support
  serial: 8250-mtk: add uart DMA support
  arm: dts: mt2701: add uart APDMA to device tree

 .../devicetree/bindings/dma/8250_mtk_dma.txt       |   33 +
 arch/arm64/boot/dts/mediatek/mt2712e.dtsi          |   50 ++
 drivers/dma/mediatek/8250_mtk_dma.c                |  894 ++++++++++++++++++++
 drivers/dma/mediatek/Kconfig                       |   11 +
 drivers/dma/mediatek/Makefile                      |    1 +
 drivers/tty/serial/8250/8250_mtk.c                 |  210 ++++-
 6 files changed, 1198 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/dma/8250_mtk_dma.txt
 create mode 100644 drivers/dma/mediatek/8250_mtk_dma.c


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