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57 lines
2.0 KiB
57 lines
2.0 KiB
* IMG Multi-threaded DMA Controller (MDC) |
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Required properties: |
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- compatible: Must be "img,pistachio-mdc-dma". |
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- reg: Must contain the base address and length of the MDC registers. |
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- interrupts: Must contain all the per-channel DMA interrupts. |
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- clocks: Must contain an entry for each entry in clock-names. |
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See ../clock/clock-bindings.txt for details. |
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- clock-names: Must include the following entries: |
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- sys: MDC system interface clock. |
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- img,cr-periph: Must contain a phandle to the peripheral control syscon |
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node which contains the DMA request to channel mapping registers. |
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- img,max-burst-multiplier: Must be the maximum supported burst size multiplier. |
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The maximum burst size is this value multiplied by the hardware-reported bus |
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width. |
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- #dma-cells: Must be 3: |
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- The first cell is the peripheral's DMA request line. |
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- The second cell is a bitmap specifying to which channels the DMA request |
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line may be mapped (i.e. bit N set indicates channel N is usable). |
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- The third cell is the thread ID to be used by the channel. |
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Optional properties: |
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- dma-channels: Number of supported DMA channels, up to 32. If not specified |
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the number reported by the hardware is used. |
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Example: |
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mdc: dma-controller@18143000 { |
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compatible = "img,pistachio-mdc-dma"; |
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reg = <0x18143000 0x1000>; |
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interrupts = <GIC_SHARED 27 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 28 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 29 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 30 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 31 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 32 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 33 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 34 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 35 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 36 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 37 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SHARED 38 IRQ_TYPE_LEVEL_HIGH>; |
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clocks = <&system_clk>; |
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clock-names = "sys"; |
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img,max-burst-multiplier = <16>; |
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img,cr-periph = <&cr_periph>; |
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#dma-cells = <3>; |
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}; |
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spi@18100f00 { |
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... |
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dmas = <&mdc 9 0xffffffff 0>, <&mdc 10 0xffffffff 0>; |
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dma-names = "tx", "rx"; |
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... |
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};
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