- CSR SiRFSoC DMA controller
See dma.txt first
Required properties:
- compatible: Should be “sirf,prima2-dmac”, “sirf,atlas7-dmac” or
“sirf,atlas7-dmac-v2” - reg: Should contain DMA registers location and length.
- interrupts: Should contain one interrupt shared by all channel
- #dma-cells: must be <1>. used to represent the number of integer
cells in the dmas property of client device. - clocks: clock required
Example:
Controller:
dmac0: dma-controller@b00b0000 {
compatible = “sirf,prima2-dmac”;
reg = <0xb00b0000 0x10000>;
interrupts = <12>;
clocks = <&clks 24>;
#dma-cells = <1>;
};
Client:
Fill the specific dma request line in dmas. In the below example, spi0 read
channel request line is 9 of the 2nd dma controller, while write channel uses
4 of the 2nd dma controller; spi1 read channel request line is 12 of the 1st
dma controller, while write channel uses 13 of the 1st dma controller:
spi0: spi@b00d0000 {
compatible = “sirf,prima2-spi”;
dmas = <&dmac1 9>,
<&dmac1 4>;
dma-names = “rx”, “tx”;
};
spi1: spi@b0170000 {
compatible = “sirf,prima2-spi”;
dmas = <&dmac0 12>,
<&dmac0 13>;
dma-names = “rx”, “tx”;
};
