The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/dma/dma-common.yaml

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

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