99 lines
2.8 KiB
YAML
99 lines
2.8 KiB
YAML
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# 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 <paul@crapouillou.net>
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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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oneOf:
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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,jz4760-bdma
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- ingenic,jz4760-mdma
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- ingenic,jz4760b-dma
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- ingenic,jz4760b-bdma
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- ingenic,jz4760b-mdma
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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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- items:
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- const: ingenic,jz4770-bdma
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- const: ingenic,jz4760b-bdma
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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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enum: [2, 3]
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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 integer cells:
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- Request type: The DMA request type specifies the device endpoint that
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will be the source or destination of the DMA transfer.
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If "#dma-cells" is 2, the request type is a single cell, and the
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direction will be unidirectional (either RX or TX but not both).
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If "#dma-cells" is 3, the request type has two cells; the first
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one corresponds to the host to device direction (TX), the second one
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corresponds to the device to host direction (RX). The DMA channel is
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then bidirectional.
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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/ingenic,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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