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Analog Device AXI-DMAC DMA controller
Required properties:
- compatible: Must be "adi,axi-dmac-1.00.a".
- reg: Specification for the controllers memory mapped register map.
- interrupts: Specification for the controllers interrupt.
- clocks: Phandle and specifier to the controllers AXI interface clock
- #dma-cells: Must be 1.
Required sub-nodes:
- adi,channels: This sub-node must contain a sub-node for each DMA channel. For
the channel sub-nodes the following bindings apply. They must match the
configuration options of the peripheral as it was instantiated.
Required properties for adi,channels sub-node:
- #size-cells: Must be 0
- #address-cells: Must be 1
Required channel sub-node properties:
- reg: Which channel this node refers to.
- adi,length-width: Width of the DMA transfer length register.
- adi,source-bus-width,
adi,destination-bus-width: Width of the source or destination bus in bits.
- adi,source-bus-type,
adi,destination-bus-type: Type of the source or destination bus. Must be one
of the following:
0 (AXI_DMAC_TYPE_AXI_MM): Memory mapped AXI interface
1 (AXI_DMAC_TYPE_AXI_STREAM): Streaming AXI interface
2 (AXI_DMAC_TYPE_AXI_FIFO): FIFO interface
Optional channel properties:
- adi,cyclic: Must be set if the channel supports hardware cyclic DMA
transfers.
- adi,2d: Must be set if the channel supports hardware 2D DMA transfers.
DMA clients connected to the AXI-DMAC DMA controller must use the format
described in the dma.txt file using a one-cell specifier. The value of the
specifier refers to the DMA channel index.
Example:
dma: dma@7c420000 {
compatible = "adi,axi-dmac-1.00.a";
reg = <0x7c420000 0x10000>;
interrupts = <0 57 0>;
clocks = <&clkc 16>;
#dma-cells = <1>;
adi,channels {
#size-cells = <0>;
#address-cells = <1>;
dma-channel@0 {
reg = <0>;
adi,source-bus-width = <32>;
adi,source-bus-type = <ADI_AXI_DMAC_TYPE_MM_AXI>;
adi,destination-bus-width = <64>;
adi,destination-bus-type = <ADI_AXI_DMAC_TYPE_FIFO>;
};
};
};
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