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[FreeBSD/FreeBSD.git] / Bindings / dma / dma-common.yaml
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
7 title: DMA Engine Generic Binding
8
9 maintainers:
10   - Vinod Koul <vkoul@kernel.org>
11
12 description:
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
17 select: false
18
19 properties:
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-mask:
28     description:
29       Bitmask of available DMA channels in ascending order that are
30       not reserved by firmware and are available to the
31       kernel. i.e. first channel corresponds to LSB.
32       The first item in the array is for channels 0-31, the second is for
33       channels 32-63, etc.
34     allOf:
35       - $ref: /schemas/types.yaml#/definitions/uint32-array
36     items:
37       minItems: 1
38       # Should be enough
39       maxItems: 255
40
41   dma-channels:
42     $ref: /schemas/types.yaml#definitions/uint32
43     description:
44       Number of DMA channels supported by the controller.
45
46   dma-requests:
47     $ref: /schemas/types.yaml#definitions/uint32
48     description:
49       Number of DMA request signals supported by the controller.
50
51 required:
52   - "#dma-cells"