tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1* ZTE ZX296702 DMA controller
2
3Required properties:
4- compatible: Should be "zte,zx296702-dma"
5- reg: Should contain DMA registers location and length.
6- interrupts: Should contain one interrupt shared by all channel
7- #dma-cells: see dma.txt, should be 1, para number
8- dma-channels: physical channels supported
9- dma-requests: virtual channels supported, each virtual channel
10 have specific request line
11- clocks: clock required
12
13Example:
14
15Controller:
16 dma: dma-controller@0x09c00000{
17 compatible = "zte,zx296702-dma";
18 reg = <0x09c00000 0x1000>;
19 clocks = <&topclk ZX296702_DMA_ACLK>;
20 interrupts = <GIC_SPI 66 IRQ_TYPE_LEVEL_HIGH>;
21 #dma-cells = <1>;
22 dma-channels = <24>;
23 dma-requests = <24>;
24 };
25
26Client:
27Use specific request line passing from dmax
28For example, spdif0 tx channel request line is 4
29 spdif0: spdif0@0b004000 {
30 #sound-dai-cells = <0>;
31 compatible = "zte,zx296702-spdif";
32 reg = <0x0b004000 0x1000>;
33 clocks = <&lsp0clk ZX296702_SPDIF0_DIV>;
34 clock-names = "tx";
35 interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
36 dmas = <&dma 4>;
37 dma-names = "tx";
38 }