1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/dma/dma-com 4 $id: http://devicetree.org/schemas/dma/dma-common.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: DMA Engine Common Properties !! 7 title: DMA Engine Generic Binding
8 8
9 maintainers: 9 maintainers:
10 - Vinod Koul <vkoul@kernel.org> 10 - Vinod Koul <vkoul@kernel.org>
11 11
12 description: 12 description:
13 Generic binding to provide a way for a drive 13 Generic binding to provide a way for a driver using DMA Engine to
14 retrieve the DMA request or channel informat 14 retrieve the DMA request or channel information that goes from a
15 hardware device to a DMA controller. 15 hardware device to a DMA controller.
16 16
17 select: false 17 select: false
18 18
19 properties: 19 properties:
20 "#dma-cells": 20 "#dma-cells":
21 minimum: 1 21 minimum: 1
22 # Should be enough 22 # Should be enough
23 maximum: 255 23 maximum: 255
24 description: 24 description:
25 Used to provide DMA controller specific 25 Used to provide DMA controller specific information.
26 26
27 dma-channel-mask: 27 dma-channel-mask:
28 description: 28 description:
29 Bitmask of available DMA channels in asc 29 Bitmask of available DMA channels in ascending order that are
30 not reserved by firmware and are availab 30 not reserved by firmware and are available to the
31 kernel. i.e. first channel corresponds t 31 kernel. i.e. first channel corresponds to LSB.
32 The first item in the array is for chann 32 The first item in the array is for channels 0-31, the second is for
33 channels 32-63, etc. 33 channels 32-63, etc.
34 $ref: /schemas/types.yaml#/definitions/uin 34 $ref: /schemas/types.yaml#/definitions/uint32-array
35 items: 35 items:
36 minItems: 1 36 minItems: 1
37 # Should be enough 37 # Should be enough
38 maxItems: 255 38 maxItems: 255
39 39
40 dma-channels: 40 dma-channels:
41 $ref: /schemas/types.yaml#/definitions/uin 41 $ref: /schemas/types.yaml#/definitions/uint32
42 description: 42 description:
43 Number of DMA channels supported by the 43 Number of DMA channels supported by the controller.
44 44
45 dma-requests: 45 dma-requests:
46 $ref: /schemas/types.yaml#/definitions/uin 46 $ref: /schemas/types.yaml#/definitions/uint32
47 description: 47 description:
48 Number of DMA request signals supported 48 Number of DMA request signals supported by the controller.
49 49
50 required: 50 required:
51 - "#dma-cells" 51 - "#dma-cells"
52 52
53 additionalProperties: true 53 additionalProperties: true
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