Documentation/devicetree/bindings/dma/brcm,bcm2835-dma.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/dma/brcm,bcm2835-dma.yaml

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/dma/brcm,bcm2835-dma.yaml
Extension
.yaml
Size
2688 bytes
Lines
103
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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Annotated Snippet

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/dma/brcm,bcm2835-dma.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: BCM2835 DMA controller

maintainers:
  - Nicolas Saenz Julienne <nsaenz@kernel.org>

description:
  The BCM2835 DMA controller has 16 channels in total. Only the lower
  13 channels have an associated IRQ. Some arbitrary channels are used by the
  VideoCore firmware (1,3,6,7 in the current firmware version). The channels
  0, 2 and 3 have special functionality and should not be used by the driver.

allOf:
  - $ref: dma-controller.yaml#

properties:
  compatible:
    const: brcm,bcm2835-dma

  reg:
    maxItems: 1

  interrupts:
    description:
      Should contain the DMA interrupts associated to the DMA channels in
      ascending order.
    minItems: 1
    maxItems: 16

  interrupt-names:
    minItems: 1
    maxItems: 16

  '#dma-cells':
    description: The single cell represents the DREQ number.
    const: 1

  brcm,dma-channel-mask:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      Bitmask of available DMA channels in ascending order that are
      not reserved by firmware and are available to the
      kernel. i.e. first channel corresponds to LSB.

unevaluatedProperties: false

required:
  - compatible
  - reg
  - interrupts
  - "#dma-cells"
  - brcm,dma-channel-mask

examples:
  - |
    dma-controller@7e007000 {
      compatible = "brcm,bcm2835-dma";
      reg = <0x7e007000 0xf00>;
      interrupts = <1 16>,
                   <1 17>,
                   <1 18>,
                   <1 19>,
                   <1 20>,
                   <1 21>,
                   <1 22>,

Annotation

Implementation Notes