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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/dma/dma-common.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: DMA Engine Generic Binding
maintainers:
- Vinod Koul <vkoul@kernel.org>
description:
Generic binding to provide a way for a driver using DMA Engine to
retrieve the DMA request or channel information that goes from a
hardware device to a DMA controller.
select: false
properties:
"#dma-cells":
minimum: 1
# Should be enough
maximum: 255
description:
Used to provide DMA controller specific information.
dma-channel-mask:
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.
The first item in the array is for channels 0-31, the second is for
channels 32-63, etc.
$ref: /schemas/types.yaml#/definitions/uint32-array
items:
minItems: 1
# Should be enough
maxItems: 255
dma-channels:
$ref: /schemas/types.yaml#definitions/uint32
description:
Number of DMA channels supported by the controller.
dma-requests:
$ref: /schemas/types.yaml#definitions/uint32
description:
Number of DMA request signals supported by the controller.
required:
- "#dma-cells"
additionalProperties: true
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