tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1* CSR SiRFSoC DMA controller
2
3See dma.txt first
4
5Required properties:
6- compatible: Should be "sirf,prima2-dmac" or "sirf,marco-dmac"
7- reg: Should contain DMA registers location and length.
8- interrupts: Should contain one interrupt shared by all channel
9- #dma-cells: must be <1>. used to represent the number of integer
10 cells in the dmas property of client device.
11- clocks: clock required
12
13Example:
14
15Controller:
16dmac0: dma-controller@b00b0000 {
17 compatible = "sirf,prima2-dmac";
18 reg = <0xb00b0000 0x10000>;
19 interrupts = <12>;
20 clocks = <&clks 24>;
21 #dma-cells = <1>;
22};
23
24
25Client:
26Fill the specific dma request line in dmas. In the below example, spi0 read
27channel request line is 9 of the 2nd dma controller, while write channel uses
284 of the 2nd dma controller; spi1 read channel request line is 12 of the 1st
29dma controller, while write channel uses 13 of the 1st dma controller:
30
31spi0: spi@b00d0000 {
32 compatible = "sirf,prima2-spi";
33 dmas = <&dmac1 9>,
34 <&dmac1 4>;
35 dma-names = "rx", "tx";
36};
37
38spi1: spi@b0170000 {
39 compatible = "sirf,prima2-spi";
40 dmas = <&dmac0 12>,
41 <&dmac0 13>;
42 dma-names = "rx", "tx";
43};