[PATCH v6 0/2] add uart DMA function

[Long Cheng]

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 v5:
-move 'requst irqs' to alloc channel
-remove tasklet.
Changes compared to v4:
-modify Kconfig depends on.
Changes compared to v3:
-fix CONFIG_PM, will cause build fail
Changes compared to v2:
-remove unimportant parameters
-instead of cookie, use APIs of virtual channel.
-use of_dma_xlate_by_chan_id.
Changes compared to v1:
-mian revised file, 8250_mtk_dma.c
--parameters renamed for standard
--remove atomic operation

Long Cheng (2):
  dmaengine: 8250_mtk_dma: add MediaTek uart DMA support
  arm: dts: mt2712: add uart APDMA to device tree

 arch/arm64/boot/dts/mediatek/mt2712e.dtsi |   50 +++
 drivers/dma/mediatek/8250_mtk_dma.c       |  694 +++++++++++++++++++++++++++++
 drivers/dma/mediatek/Kconfig              |   11 +
 drivers/dma/mediatek/Makefile             |    1 +
 4 files changed, 756 insertions(+)
 create mode 100644 drivers/dma/mediatek/8250_mtk_dma.c

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1.7.9.5