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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/dma/loongson,ls2k0300-dma.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

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%YAML 1.2

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---

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$id: http://devicetree.org/schemas/dma/loongson,ls2k0300-dma.yaml#

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$schema: http://devicetree.org/meta-schemas/core.yaml#

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title: Loongson-2 Multi-Channel DMA controller

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description:

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  The Loongson-2 Multi-Channel DMA controller is used for transferring data

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  between system memory and the peripherals on the APB bus.

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maintainers:

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  - Binbin Zhou <zhoubinbin@loongson.cn>

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allOf:

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  - $ref: dma-controller.yaml#

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properties:

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  compatible:

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    enum:

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      - loongson,ls2k0300-dma

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      - loongson,ls2k3000-dma

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  reg:

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    maxItems: 1

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  interrupts:

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    description:

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      Should contain all of the per-channel DMA interrupts in ascending order

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      with respect to the DMA channel index.

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    minItems: 4

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    maxItems: 8

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  clocks:

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    maxItems: 1

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  '#dma-cells':

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    const: 2

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    description: |

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      DMA request from clients consists of 2 cells:

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        1. Channel index

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        2. Transfer request factor number, If no transfer factor, use 0.

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           The number is SoC-specific, and this should be specified with

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           relation to the device to use the DMA controller.

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  dma-channels:

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    enum: [4, 8]

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required:

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  - compatible

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  - reg

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  - interrupts

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  - clocks

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  - '#dma-cells'

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  - dma-channels

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unevaluatedProperties: false

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examples:

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  - |

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    #include <dt-bindings/interrupt-controller/irq.h>

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    #include <dt-bindings/clock/loongson,ls2k-clk.h>

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    dma-controller@1612c000 {

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        compatible = "loongson,ls2k0300-dma";

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        reg = <0x1612c000 0xff>;

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        interrupt-parent = <&liointc0>;

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        interrupts = <23 IRQ_TYPE_LEVEL_HIGH>,

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                     <24 IRQ_TYPE_LEVEL_HIGH>,

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                     <25 IRQ_TYPE_LEVEL_HIGH>,

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                     <26 IRQ_TYPE_LEVEL_HIGH>,

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                     <27 IRQ_TYPE_LEVEL_HIGH>,

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                     <28 IRQ_TYPE_LEVEL_HIGH>,

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                     <29 IRQ_TYPE_LEVEL_HIGH>,

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                     <30 IRQ_TYPE_LEVEL_HIGH>;

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        clocks = <&clk LS2K0300_CLK_APB_GATE>;

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        #dma-cells = <2>;

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        dma-channels = <8>;

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    };

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...

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