Merge tag 'timers-urgent-2020-12-27' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / Documentation / devicetree / bindings / dma / ingenic,dma.yaml
1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/dma/ingenic,dma.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Ingenic SoCs DMA Controller DT bindings
8
9 maintainers:
10   - Paul Cercueil <paul@crapouillou.net>
11
12 allOf:
13   - $ref: "dma-controller.yaml#"
14
15 properties:
16   compatible:
17     enum:
18       - ingenic,jz4740-dma
19       - ingenic,jz4725b-dma
20       - ingenic,jz4770-dma
21       - ingenic,jz4780-dma
22       - ingenic,x1000-dma
23       - ingenic,x1830-dma
24
25   reg:
26     items:
27       - description: Channel-specific registers
28       - description: System control registers
29
30   interrupts:
31     maxItems: 1
32
33   clocks:
34     maxItems: 1
35
36   "#dma-cells":
37     const: 2
38     description: >
39       DMA clients must use the format described in dma.txt, giving a phandle
40       to the DMA controller plus the following 2 integer cells:
41
42       - Request type: The DMA request type for transfers to/from the
43         device on the allocated channel, as defined in the SoC documentation.
44
45       - Channel: If set to 0xffffffff, any available channel will be allocated
46         for the client. Otherwise, the exact channel specified will be used.
47         The channel should be reserved on the DMA controller using the
48         ingenic,reserved-channels property.
49
50   ingenic,reserved-channels:
51     $ref: /schemas/types.yaml#/definitions/uint32
52     description: >
53       Bitmask of channels to reserve for devices that need a specific
54       channel. These channels will only be assigned when explicitely
55       requested by a client. The primary use for this is channels 0 and
56       1, which can be configured to have special behaviour for NAND/BCH
57       when using programmable firmware.
58
59 required:
60   - compatible
61   - reg
62   - interrupts
63   - clocks
64
65 unevaluatedProperties: false
66
67 examples:
68   - |
69     #include <dt-bindings/clock/jz4780-cgu.h>
70     dma: dma-controller@13420000 {
71       compatible = "ingenic,jz4780-dma";
72       reg = <0x13420000 0x400>, <0x13421000 0x40>;
73
74       interrupt-parent = <&intc>;
75       interrupts = <10>;
76
77       clocks = <&cgu JZ4780_CLK_PDMA>;
78
79       #dma-cells = <2>;
80
81       ingenic,reserved-channels = <0x3>;
82     };