Commit | Line | Data |
---|---|---|
91d457dd AB |
1 | * IMG Multi-threaded DMA Controller (MDC) |
2 | ||
3 | Required properties: | |
4 | - compatible: Must be "img,pistachio-mdc-dma". | |
5 | - reg: Must contain the base address and length of the MDC registers. | |
6 | - interrupts: Must contain all the per-channel DMA interrupts. | |
7 | - clocks: Must contain an entry for each entry in clock-names. | |
8 | See ../clock/clock-bindings.txt for details. | |
9 | - clock-names: Must include the following entries: | |
10 | - sys: MDC system interface clock. | |
11 | - img,cr-periph: Must contain a phandle to the peripheral control syscon | |
12 | node which contains the DMA request to channel mapping registers. | |
13 | - img,max-burst-multiplier: Must be the maximum supported burst size multiplier. | |
14 | The maximum burst size is this value multiplied by the hardware-reported bus | |
15 | width. | |
16 | - #dma-cells: Must be 3: | |
17 | - The first cell is the peripheral's DMA request line. | |
18 | - The second cell is a bitmap specifying to which channels the DMA request | |
19 | line may be mapped (i.e. bit N set indicates channel N is usable). | |
20 | - The third cell is the thread ID to be used by the channel. | |
21 | ||
22 | Optional properties: | |
23 | - dma-channels: Number of supported DMA channels, up to 32. If not specified | |
24 | the number reported by the hardware is used. | |
25 | ||
26 | Example: | |
27 | ||
28 | mdc: dma-controller@18143000 { | |
29 | compatible = "img,pistachio-mdc-dma"; | |
30 | reg = <0x18143000 0x1000>; | |
31 | interrupts = <GIC_SHARED 27 IRQ_TYPE_LEVEL_HIGH>, | |
32 | <GIC_SHARED 28 IRQ_TYPE_LEVEL_HIGH>, | |
33 | <GIC_SHARED 29 IRQ_TYPE_LEVEL_HIGH>, | |
34 | <GIC_SHARED 30 IRQ_TYPE_LEVEL_HIGH>, | |
35 | <GIC_SHARED 31 IRQ_TYPE_LEVEL_HIGH>, | |
36 | <GIC_SHARED 32 IRQ_TYPE_LEVEL_HIGH>, | |
37 | <GIC_SHARED 33 IRQ_TYPE_LEVEL_HIGH>, | |
38 | <GIC_SHARED 34 IRQ_TYPE_LEVEL_HIGH>, | |
39 | <GIC_SHARED 35 IRQ_TYPE_LEVEL_HIGH>, | |
40 | <GIC_SHARED 36 IRQ_TYPE_LEVEL_HIGH>, | |
41 | <GIC_SHARED 37 IRQ_TYPE_LEVEL_HIGH>, | |
42 | <GIC_SHARED 38 IRQ_TYPE_LEVEL_HIGH>; | |
43 | clocks = <&system_clk>; | |
44 | clock-names = "sys"; | |
45 | ||
46 | img,max-burst-multiplier = <16>; | |
47 | img,cr-periph = <&cr_periph>; | |
48 | ||
49 | #dma-cells = <3>; | |
50 | }; | |
51 | ||
52 | spi@18100f00 { | |
53 | ... | |
54 | dmas = <&mdc 9 0xffffffff 0>, <&mdc 10 0xffffffff 0>; | |
55 | dma-names = "tx", "rx"; | |
56 | ... | |
57 | }; |