1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/dma/socionext,uniphier-xdmac.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Socionext UniPhier external DMA controller
8
9 description: |
10 This describes the devicetree bindings for an external DMA engine to perform
11 memory-to-memory or peripheral-to-memory data transfer capable of supporting
12 16 channels, implemented in Socionext UniPhier SoCs.
13
14 maintainers:
15 - Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
16
17 allOf:
18 - $ref: dma-controller.yaml#
19
20 properties:
21 compatible:
22 const: socionext,uniphier-xdmac
23
24 reg:
25 maxItems: 1
26
27 interrupts:
28 maxItems: 1
29
30 "#dma-cells":
31 const: 2
32 description: |
33 DMA request from clients consists of 2 cells:
34 1. Channel index
35 2. Transfer request factor number, If no transfer factor, use 0.
36 The number is SoC-specific, and this should be specified with
37 relation to the device to use the DMA controller.
38
39 dma-channels:
40 minimum: 1
41 maximum: 16
42
43 additionalProperties: false
44
45 required:
46 - compatible
47 - reg
48 - interrupts
49 - "#dma-cells"
50 - dma-channels
51
52 examples:
53 - |
54 xdmac: dma-controller@5fc10000 {
55 compatible = "socionext,uniphier-xdmac";
56 reg = <0x5fc10000 0x5300>;
57 interrupts = <0 188 4>;
58 #dma-cells = <2>;
59 dma-channels = <16>;
60 };
61
62 ...
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