Documentation/devicetree/bindings/dma/dma-common.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/dma/dma-common.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: DMA Engine Generic Binding

maintainers:
  - Vinod Koul <vkoul@kernel.org>

description:
  Generic binding to provide a way for a driver using DMA Engine to
  retrieve the DMA request or channel information that goes from a
  hardware device to a DMA controller.

select: false

properties:
  "#dma-cells":
    minimum: 1
    # Should be enough
    maximum: 255
    description:
      Used to provide DMA controller specific information.

  dma-channel-mask:
    $ref: /schemas/types.yaml#definitions/uint32
    description:
      Bitmask of available DMA channels in ascending order that are
      not reserved by firmware and are available to the
      kernel. i.e. first channel corresponds to LSB.

  dma-channels:
    $ref: /schemas/types.yaml#definitions/uint32
    description:
      Number of DMA channels supported by the controller.

  dma-requests:
    $ref: /schemas/types.yaml#definitions/uint32
    description:
      Number of DMA request signals supported by the controller.

required:
  - "#dma-cells"