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| -rw-r--r-- | Documentation/devicetree/bindings/dma/mmp-dma.txt | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/mmp-dma.txt b/Documentation/devicetree/bindings/dma/mmp-dma.txt new file mode 100644 index 000000000..8f7364a7b --- /dev/null +++ b/Documentation/devicetree/bindings/dma/mmp-dma.txt @@ -0,0 +1,79 @@ +* MARVELL MMP DMA controller + +Marvell Peripheral DMA Controller +Used platforms: 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 + +Optional properties: +- #dma-channels: Number of DMA channels supported by the controller (defaults + to 32 when not specified) +- #dma-requests: Number of DMA requestor lines supported by the controller + (defaults to 32 when not specified) + +"marvell,pdma-1.0" +Used platforms: 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 platforms: 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>; + }; |