54 lines
1.4 KiB
YAML
54 lines
1.4 KiB
YAML
|
# 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 Common Properties
|
||
|
|
|
||
|
|
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
|