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| -rw-r--r-- | Documentation/devicetree/bindings/dma/img-mdc-dma.txt | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/img-mdc-dma.txt b/Documentation/devicetree/bindings/dma/img-mdc-dma.txt new file mode 100644 index 0000000..28c1341 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/img-mdc-dma.txt @@ -0,0 +1,57 @@ +* IMG Multi-threaded DMA Controller (MDC) + +Required properties: +- compatible: Must be "img,pistachio-mdc-dma". +- reg: Must contain the base address and length of the MDC registers. +- interrupts: Must contain all the per-channel DMA interrupts. +- clocks: Must contain an entry for each entry in clock-names. + See ../clock/clock-bindings.txt for details. +- clock-names: Must include the following entries: + - sys: MDC system interface clock. +- img,cr-periph: Must contain a phandle to the peripheral control syscon + node which contains the DMA request to channel mapping registers. +- img,max-burst-multiplier: Must be the maximum supported burst size multiplier. + The maximum burst size is this value multiplied by the hardware-reported bus + width. +- #dma-cells: Must be 3: + - The first cell is the peripheral's DMA request line. + - The second cell is a bitmap specifying to which channels the DMA request + line may be mapped (i.e. bit N set indicates channel N is usable). + - The third cell is the thread ID to be used by the channel. + +Optional properties: +- dma-channels: Number of supported DMA channels, up to 32. If not specified + the number reported by the hardware is used. + +Example: + +mdc: dma-controller@18143000 { + compatible = "img,pistachio-mdc-dma"; + reg = <0x18143000 0x1000>; + interrupts = <GIC_SHARED 27 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 28 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 29 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 30 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 31 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 32 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 33 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 34 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 35 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 36 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 37 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SHARED 38 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&system_clk>; + clock-names = "sys"; + + img,max-burst-multiplier = <16>; + img,cr-periph = <&cr_periph>; + + #dma-cells = <3>; +}; + +spi@18100f00 { + ... + dmas = <&mdc 9 0xffffffff 0>, <&mdc 10 0xffffffff 0>; + dma-names = "tx", "rx"; + ... +}; |
