Skip to content

Commit

Permalink
Merge branch 'dt2' of git://github.com/hzhuang1/linux into next/dt
Browse files Browse the repository at this point in the history
From Haojian Zhuang:
* 'dt2' of git://github.com/hzhuang1/linux:
  ARM: dt: mmp-dma: add binding file
  • Loading branch information
Olof Johansson committed Sep 29, 2012
2 parents db404e7 + 37586e0 commit 4b1ebb6
Showing 1 changed file with 74 additions and 0 deletions.
74 changes: 74 additions & 0 deletions Documentation/devicetree/bindings/dma/mmp-dma.txt
Original file line number Diff line number Diff line change
@@ -0,0 +1,74 @@
* MARVELL MMP DMA controller

Marvell Peripheral DMA Controller
Used platfroms: pxa688, pxa910, pxa3xx, etc

Required properties:
- compatible: Should be "marvell,pdma-1.0"
- reg: Should contain DMA registers location and length.
- interrupts: Either contain all of the per-channel DMA interrupts
or one irq for pdma device
- #dma-channels: Number of DMA channels supported by the controller.

"marvell,pdma-1.0"
Used platfroms: pxa25x, pxa27x, pxa3xx, pxa93x, pxa168, pxa910, pxa688.

Examples:

/*
* Each channel has specific irq
* ICU parse out irq channel from ICU register,
* while DMA controller may not able to distinguish the irq channel
* Using this method, interrupt-parent is required as demuxer
* For example, pxa688 icu register 0x128, bit 0~15 is PDMA channel irq,
* 18~21 is ADMA irq
*/
pdma: dma-controller@d4000000 {
compatible = "marvell,pdma-1.0";
reg = <0xd4000000 0x10000>;
interrupts = <0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15>;
interrupt-parent = <&intcmux32>;
#dma-channels = <16>;
};

/*
* One irq for all channels
* Dmaengine driver (DMA controller) distinguish irq channel via
* parsing internal register
*/
pdma: dma-controller@d4000000 {
compatible = "marvell,pdma-1.0";
reg = <0xd4000000 0x10000>;
interrupts = <47>;
#dma-channels = <16>;
};


Marvell Two Channel DMA Controller used specifically for audio
Used platfroms: pxa688, pxa910

Required properties:
- compatible: Should be "marvell,adma-1.0" or "marvell,pxa910-squ"
- reg: Should contain DMA registers location and length.
- interrupts: Either contain all of the per-channel DMA interrupts
or one irq for dma device

"marvell,adma-1.0" used on pxa688
"marvell,pxa910-squ" used on pxa910

Examples:

/* each channel has specific irq */
adma0: dma-controller@d42a0800 {
compatible = "marvell,adma-1.0";
reg = <0xd42a0800 0x100>;
interrupts = <18 19>;
interrupt-parent = <&intcmux32>;
};

/* One irq for all channels */
squ: dma-controller@d42a0800 {
compatible = "marvell,pxa910-squ";
reg = <0xd42a0800 0x100>;
interrupts = <46>;
};

0 comments on commit 4b1ebb6

Please sign in to comment.