forked from Minki/linux
46 lines
1.1 KiB
Plaintext
46 lines
1.1 KiB
Plaintext
|
MOXA ART DMA Controller
|
||
|
|
|
||
|
|
See dma.txt first
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
|
||
|
|
- compatible : Must be "moxa,moxart-dma"
|
||
|
|
- reg : Should contain registers location and length
|
||
|
|
- interrupts : Should contain an interrupt-specifier for the sole
|
||
|
|
interrupt generated by the device
|
||
|
|
- #dma-cells : Should be 1, a single cell holding a line request number
|
||
|
|
|
||
|
|
Example:
|
||
|
|
|
||
|
|
dma: dma@90500000 {
|
||
|
|
compatible = "moxa,moxart-dma";
|
||
|
|
reg = <0x90500080 0x40>;
|
||
|
|
interrupts = <24 0>;
|
||
|
|
#dma-cells = <1>;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
Clients:
|
||
|
|
|
||
|
|
DMA clients connected to the MOXA ART DMA controller must use the format
|
||
|
|
described in the dma.txt file, using a two-cell specifier for each channel:
|
||
|
|
a phandle plus one integer cells.
|
||
|
|
The two cells in order are:
|
||
|
|
|
||
|
|
1. A phandle pointing to the DMA controller.
|
||
|
|
2. Peripheral identifier for the hardware handshaking interface.
|
||
|
|
|
||
|
|
Example:
|
||
|
|
Use specific request line passing from dma
|
||
|
|
For example, MMC request line is 5
|
||
|
|
|
||
|
|
sdhci: sdhci@98e00000 {
|
||
|
|
compatible = "moxa,moxart-sdhci";
|
||
|
|
reg = <0x98e00000 0x5C>;
|
||
|
|
interrupts = <5 0>;
|
||
|
|
clocks = <&clk_apb>;
|
||
|
|
dmas = <&dma 5>,
|
||
|
|
<&dma 5>;
|
||
|
|
dma-names = "tx", "rx";
|
||
|
|
};
|