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
