projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 5f9e685a JJ |
1 | MOXA ART DMA Controller |
| 2 | ||
| 3 | See dma.txt first | |
| 4 | ||
| 5 | Required properties: | |
| 6 | ||
| 7 | - compatible : Must be "moxa,moxart-dma" | |
| 8 | - reg : Should contain registers location and length | |
| 9 | - interrupts : Should contain an interrupt-specifier for the sole | |
| 10 | interrupt generated by the device | |
| 11 | - #dma-cells : Should be 1, a single cell holding a line request number | |
| 12 | ||
| 13 | Example: | |
| 14 | ||
| 15 | dma: dma@90500000 { | |
| 16 | compatible = "moxa,moxart-dma"; | |
| 17 | reg = <0x90500080 0x40>; | |
| 18 | interrupts = <24 0>; | |
| 19 | #dma-cells = <1>; | |
| 20 | }; | |
| 21 | ||
| 22 | ||
| 23 | Clients: | |
| 24 | ||
| 25 | DMA clients connected to the MOXA ART DMA controller must use the format | |
| 26 | described in the dma.txt file, using a two-cell specifier for each channel: | |
| 27 | a phandle plus one integer cells. | |
| 28 | The two cells in order are: | |
| 29 | ||
| 30 | 1. A phandle pointing to the DMA controller. | |
| 31 | 2. Peripheral identifier for the hardware handshaking interface. | |
| 32 | ||
| 33 | Example: | |
| 34 | Use specific request line passing from dma | |
| 35 | For example, MMC request line is 5 | |
| 36 | ||
| 37 | sdhci: sdhci@98e00000 { | |
| 38 | compatible = "moxa,moxart-sdhci"; | |
| 39 | reg = <0x98e00000 0x5C>; | |
| 40 | interrupts = <5 0>; | |
| 41 | clocks = <&clk_apb>; | |
| 42 | dmas = <&dma 5>, | |
| 43 | <&dma 5>; | |
| 44 | dma-names = "tx", "rx"; | |
| 45 | }; |