Documentation/devicetree/bindings/dma/mediatek,uart-dma.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/dma/mediatek,uart-dma.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: MediaTek UART APDMA controller

maintainers:
  - Long Cheng <long.cheng@mediatek.com>

description: |
  The MediaTek UART APDMA controller provides DMA capabilities
  for the UART peripheral bus.

allOf:
  - $ref: dma-controller.yaml#

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - mediatek,mt2712-uart-dma
              - mediatek,mt6795-uart-dma
              - mediatek,mt8365-uart-dma
              - mediatek,mt8516-uart-dma
          - const: mediatek,mt6577-uart-dma
      - enum:
          - mediatek,mt6577-uart-dma

  reg:
    minItems: 1
    maxItems: 16

  interrupts:
    description: |
      TX, RX interrupt lines for each UART APDMA channel
    minItems: 1
    maxItems: 16

  clocks:
    description: Must contain one entry for the APDMA main clock
    maxItems: 1

  clock-names:
    const: apdma

  "#dma-cells":
    const: 1
    description: |
      The first cell specifies the UART APDMA channel number

  dma-requests:
    description: |
      Number of virtual channels of the UART APDMA controller
    maximum: 16

  mediatek,dma-33bits:
    type: boolean
    description: Enable 33-bits UART APDMA support

required:
  - compatible
  - reg
  - interrupts

additionalProperties: false

if:
  not:
    required:
      - dma-requests
then:
  properties:
    interrupts:
      maxItems: 8
    reg:
      maxItems: 8

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/clock/mt2712-clk.h>
    soc {
        #address-cells = <2>;
        #size-cells = <2>;

        apdma: dma-controller@11000400 {
            compatible = "mediatek,mt2712-uart-dma",
                         "mediatek,mt6577-uart-dma";
            reg = <0 0x11000400 0 0x80>,
                  <0 0x11000480 0 0x80>,
                  <0 0x11000500 0 0x80>,
                  <0 0x11000580 0 0x80>,
                  <0 0x11000600 0 0x80>,
                  <0 0x11000680 0 0x80>,
                  <0 0x11000700 0 0x80>,
                  <0 0x11000780 0 0x80>,
                  <0 0x11000800 0 0x80>,
                  <0 0x11000880 0 0x80>,
                  <0 0x11000900 0 0x80>,
                  <0 0x11000980 0 0x80>;
            interrupts = <GIC_SPI 103 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 104 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 105 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 106 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 107 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 108 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 109 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 110 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 111 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 112 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 113 IRQ_TYPE_LEVEL_LOW>,
                         <GIC_SPI 114 IRQ_TYPE_LEVEL_LOW>;
            dma-requests = <12>;
            clocks = <&pericfg CLK_PERI_AP_DMA>;
            clock-names = "apdma";
            mediatek,dma-33bits;
            #dma-cells = <1>;
        };
    };

...