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84 lines
2.2 KiB
84 lines
2.2 KiB
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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%YAML 1.2 |
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--- |
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$id: http://devicetree.org/schemas/dma/ingenic,dma.yaml# |
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$schema: http://devicetree.org/meta-schemas/core.yaml# |
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title: Ingenic SoCs DMA Controller DT bindings |
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maintainers: |
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- Paul Cercueil <[email protected]> |
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allOf: |
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- $ref: "dma-controller.yaml#" |
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properties: |
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compatible: |
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enum: |
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- ingenic,jz4740-dma |
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- ingenic,jz4725b-dma |
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- ingenic,jz4760-dma |
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- ingenic,jz4760b-dma |
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- ingenic,jz4770-dma |
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- ingenic,jz4780-dma |
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- ingenic,x1000-dma |
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- ingenic,x1830-dma |
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reg: |
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items: |
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- description: Channel-specific registers |
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- description: System control registers |
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interrupts: |
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maxItems: 1 |
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clocks: |
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maxItems: 1 |
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"#dma-cells": |
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const: 2 |
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description: > |
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DMA clients must use the format described in dma.txt, giving a phandle |
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to the DMA controller plus the following 2 integer cells: |
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- Request type: The DMA request type for transfers to/from the |
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device on the allocated channel, as defined in the SoC documentation. |
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- Channel: If set to 0xffffffff, any available channel will be allocated |
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for the client. Otherwise, the exact channel specified will be used. |
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The channel should be reserved on the DMA controller using the |
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ingenic,reserved-channels property. |
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ingenic,reserved-channels: |
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$ref: /schemas/types.yaml#/definitions/uint32 |
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description: > |
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Bitmask of channels to reserve for devices that need a specific |
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channel. These channels will only be assigned when explicitely |
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requested by a client. The primary use for this is channels 0 and |
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1, which can be configured to have special behaviour for NAND/BCH |
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when using programmable firmware. |
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required: |
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- compatible |
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- reg |
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- interrupts |
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- clocks |
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unevaluatedProperties: false |
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examples: |
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- | |
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#include <dt-bindings/clock/jz4780-cgu.h> |
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dma: dma-controller@13420000 { |
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compatible = "ingenic,jz4780-dma"; |
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reg = <0x13420000 0x400>, <0x13421000 0x40>; |
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interrupt-parent = <&intc>; |
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interrupts = <10>; |
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clocks = <&cgu JZ4780_CLK_PDMA>; |
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#dma-cells = <2>; |
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ingenic,reserved-channels = <0x3>; |
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};
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