58 lines
2.0 KiB
Plaintext
58 lines
2.0 KiB
Plaintext
* IMG Multi-threaded DMA Controller (MDC)
|
|
|
|
Required properties:
|
|
- compatible: Must be "img,pistachio-mdc-dma".
|
|
- reg: Must contain the base address and length of the MDC registers.
|
|
- interrupts: Must contain all the per-channel DMA interrupts.
|
|
- clocks: Must contain an entry for each entry in clock-names.
|
|
See ../clock/clock-bindings.txt for details.
|
|
- clock-names: Must include the following entries:
|
|
- sys: MDC system interface clock.
|
|
- img,cr-periph: Must contain a phandle to the peripheral control syscon
|
|
node which contains the DMA request to channel mapping registers.
|
|
- img,max-burst-multiplier: Must be the maximum supported burst size multiplier.
|
|
The maximum burst size is this value multiplied by the hardware-reported bus
|
|
width.
|
|
- #dma-cells: Must be 3:
|
|
- The first cell is the peripheral's DMA request line.
|
|
- The second cell is a bitmap specifying to which channels the DMA request
|
|
line may be mapped (i.e. bit N set indicates channel N is usable).
|
|
- The third cell is the thread ID to be used by the channel.
|
|
|
|
Optional properties:
|
|
- dma-channels: Number of supported DMA channels, up to 32. If not specified
|
|
the number reported by the hardware is used.
|
|
|
|
Example:
|
|
|
|
mdc: dma-controller@18143000 {
|
|
compatible = "img,pistachio-mdc-dma";
|
|
reg = <0x18143000 0x1000>;
|
|
interrupts = <GIC_SHARED 27 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 28 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 29 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 30 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 31 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 32 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 33 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 34 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 35 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 36 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 37 IRQ_TYPE_LEVEL_HIGH>,
|
|
<GIC_SHARED 38 IRQ_TYPE_LEVEL_HIGH>;
|
|
clocks = <&system_clk>;
|
|
clock-names = "sys";
|
|
|
|
img,max-burst-multiplier = <16>;
|
|
img,cr-periph = <&cr_periph>;
|
|
|
|
#dma-cells = <3>;
|
|
};
|
|
|
|
spi@18100f00 {
|
|
...
|
|
dmas = <&mdc 9 0xffffffff 0>, <&mdc 10 0xffffffff 0>;
|
|
dma-names = "tx", "rx";
|
|
...
|
|
};
|