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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/contrib/device-tree/Bindings/dma/mmp-dma.txt
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* MARVELL MMP DMA controller

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Marvell Peripheral DMA Controller

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Used platforms: pxa688, pxa910, pxa3xx, etc

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Required properties:

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- compatible: Should be "marvell,pdma-1.0"

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- reg: Should contain DMA registers location and length.

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- interrupts: Either contain all of the per-channel DMA interrupts

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		or one irq for pdma device

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Optional properties:

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- dma-channels: Number of DMA channels supported by the controller (defaults

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  to 32 when not specified)

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- #dma-channels: deprecated

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- dma-requests: Number of DMA requestor lines supported by the controller

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  (defaults to 32 when not specified)

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- #dma-requests: deprecated

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"marvell,pdma-1.0"

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Used platforms: pxa25x, pxa27x, pxa3xx, pxa93x, pxa168, pxa910, pxa688.

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Examples:

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/*

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 * Each channel has specific irq

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 * ICU parse out irq channel from ICU register,

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 * while DMA controller may not able to distinguish the irq channel

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 * Using this method, interrupt-parent is required as demuxer

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 * For example, pxa688 icu register 0x128, bit 0~15 is PDMA channel irq,

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 * 18~21 is ADMA irq

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 */

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pdma: dma-controller@d4000000 {

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	      compatible = "marvell,pdma-1.0";

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	      reg = <0xd4000000 0x10000>;

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	      interrupts = <0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15>;

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	      interrupt-parent = <&intcmux32>;

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	      dma-channels = <16>;

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      };

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/*

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 * One irq for all channels

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 * Dmaengine driver (DMA controller) distinguish irq channel via

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 * parsing internal register

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 */

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pdma: dma-controller@d4000000 {

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	      compatible = "marvell,pdma-1.0";

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	      reg = <0xd4000000 0x10000>;

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	      interrupts = <47>;

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	      dma-channels = <16>;

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      };

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Marvell Two Channel DMA Controller used specifically for audio

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Used platforms: pxa688, pxa910

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Required properties:

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- compatible: Should be "marvell,adma-1.0" or "marvell,pxa910-squ"

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- reg: Should contain DMA registers location and length.

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- interrupts: Either contain all of the per-channel DMA interrupts

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		or one irq for dma device

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"marvell,adma-1.0" used on pxa688

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"marvell,pxa910-squ" used on pxa910

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Examples:

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/* each channel has specific irq */

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adma0: dma-controller@d42a0800 {

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	      compatible = "marvell,adma-1.0";

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	      reg = <0xd42a0800 0x100>;

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	      interrupts = <18 19>;

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	      interrupt-parent = <&intcmux32>;

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      };

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/* One irq for all channels */

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squ: dma-controller@d42a0800 {

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	      compatible = "marvell,pxa910-squ";

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	      reg = <0xd42a0800 0x100>;

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	      interrupts = <46>;

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      };

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