1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/dma/dma-common.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: DMA Engine Generic Binding
8
9maintainers:
10  - Vinod Koul <vkoul@kernel.org>
11
12description:
13  Generic binding to provide a way for a driver using DMA Engine to
14  retrieve the DMA request or channel information that goes from a
15  hardware device to a DMA controller.
16
17select: false
18
19properties:
20  "#dma-cells":
21    minimum: 1
22    # Should be enough
23    maximum: 255
24    description:
25      Used to provide DMA controller specific information.
26
27  dma-channel-masks:
28    $ref: /schemas/types.yaml#definitions/uint32
29    description:
30      Bitmask of available DMA channels in ascending order that are
31      not reserved by firmware and are available to the
32      kernel. i.e. first channel corresponds to LSB.
33
34  dma-channels:
35    $ref: /schemas/types.yaml#definitions/uint32
36    description:
37      Number of DMA channels supported by the controller.
38
39  dma-requests:
40    $ref: /schemas/types.yaml#definitions/uint32
41    description:
42      Number of DMA request signals supported by the controller.
43
44required:
45  - "#dma-cells"
46