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

title: Socionext UniPhier external DMA controller

description: |
  This describes the devicetree bindings for an external DMA engine to perform
  memory-to-memory or peripheral-to-memory data transfer capable of supporting
  16 channels, implemented in Socionext UniPhier SoCs.

maintainers:
  - Kunihiko Hayashi <hayashi.kunihiko@socionext.com>

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

properties:
  compatible:
    const: socionext,uniphier-xdmac

  reg:
    items:
      - description: XDMAC base register region (offset and length)
      - description: XDMAC extension register region (offset and length)

  interrupts:
    maxItems: 1

  "#dma-cells":
    const: 2
    description: |
      DMA request from clients consists of 2 cells:
        1. Channel index
        2. Transfer request factor number, If no transfer factor, use 0.
           The number is SoC-specific, and this should be specified with
           relation to the device to use the DMA controller.

  dma-channels:
    minimum: 1
    maximum: 16

additionalProperties: false

required:
  - compatible
  - reg
  - interrupts
  - "#dma-cells"

examples:
  - |
    xdmac: dma-controller@5fc10000 {
        compatible = "socionext,uniphier-xdmac";
        reg = <0x5fc10000 0x1000>, <0x5fc20000 0x800>;
        interrupts = <0 188 4>;
        #dma-cells = <2>;
        dma-channels = <16>;
    };

...