tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1UniPhier Media IO DMA controller
2
3This works as an external DMA engine for SD/eMMC controllers etc.
4found in UniPhier LD4, Pro4, sLD8 SoCs.
5
6Required properties:
7- compatible: should be "socionext,uniphier-mio-dmac".
8- reg: offset and length of the register set for the device.
9- interrupts: a list of interrupt specifiers associated with the DMA channels.
10- clocks: a single clock specifier.
11- #dma-cells: should be <1>. The single cell represents the channel index.
12
13Example:
14 dmac: dma-controller@5a000000 {
15 compatible = "socionext,uniphier-mio-dmac";
16 reg = <0x5a000000 0x1000>;
17 interrupts = <0 68 4>, <0 68 4>, <0 69 4>, <0 70 4>,
18 <0 71 4>, <0 72 4>, <0 73 4>, <0 74 4>;
19 clocks = <&mio_clk 7>;
20 #dma-cells = <1>;
21 };
22
23Note:
24In the example above, "interrupts = <0 68 4>, <0 68 4>, ..." is not a typo.
25The first two channels share a single interrupt line.