54 lines
1.4 KiB
YAML
54 lines
1.4 KiB
YAML
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# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/dma/dma-common.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: DMA Engine Generic Binding
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maintainers:
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- Vinod Koul <vkoul@kernel.org>
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description:
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Generic binding to provide a way for a driver using DMA Engine to
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retrieve the DMA request or channel information that goes from a
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hardware device to a DMA controller.
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select: false
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properties:
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"#dma-cells":
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minimum: 1
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# Should be enough
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maximum: 255
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description:
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Used to provide DMA controller specific information.
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dma-channel-mask:
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description:
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Bitmask of available DMA channels in ascending order that are
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not reserved by firmware and are available to the
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kernel. i.e. first channel corresponds to LSB.
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The first item in the array is for channels 0-31, the second is for
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channels 32-63, etc.
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$ref: /schemas/types.yaml#/definitions/uint32-array
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items:
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minItems: 1
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# Should be enough
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maxItems: 255
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dma-channels:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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Number of DMA channels supported by the controller.
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dma-requests:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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Number of DMA request signals supported by the controller.
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required:
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- "#dma-cells"
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additionalProperties: true
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