# 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 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