projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 8e6152bc ZG |
1 | * Hisilicon K3 DMA controller |
| 2 | ||
| 3 | See dma.txt first | |
| 4 | ||
| 5 | Required properties: | |
| 6 | - compatible: Should be "hisilicon,k3-dma-1.0" | |
| 7 | - reg: Should contain DMA registers location and length. | |
| 8 | - interrupts: Should contain one interrupt shared by all channel | |
| 9 | - #dma-cells: see dma.txt, should be 1, para number | |
| 10 | - dma-channels: physical channels supported | |
| 11 | - dma-requests: virtual channels supported, each virtual channel | |
| 12 | have specific request line | |
| 13 | - clocks: clock required | |
| 14 | ||
| 15 | Example: | |
| 16 | ||
| 17 | Controller: | |
| 18 | dma0: dma@fcd02000 { | |
| 19 | compatible = "hisilicon,k3-dma-1.0"; | |
| 20 | reg = <0xfcd02000 0x1000>; | |
| 21 | #dma-cells = <1>; | |
| 22 | dma-channels = <16>; | |
| 23 | dma-requests = <27>; | |
| 24 | interrupts = <0 12 4>; | |
| 25 | clocks = <&pclk>; | |
| 26 | status = "disable"; | |
| 27 | }; | |
| 28 | ||
| 29 | Client: | |
| 30 | Use specific request line passing from dmax | |
| 31 | For example, i2c0 read channel request line is 18, while write channel use 19 | |
| 32 | ||
| 33 | i2c0: i2c@fcb08000 { | |
| 34 | compatible = "snps,designware-i2c"; | |
| 35 | dmas = <&dma0 18 /* read channel */ | |
| 36 | &dma0 19>; /* write channel */ | |
| 37 | dma-names = "rx", "tx"; | |
| 38 | }; | |
| 39 | ||
| 40 | i2c1: i2c@fcb09000 { | |
| 41 | compatible = "snps,designware-i2c"; | |
| 42 | dmas = <&dma0 20 /* read channel */ | |
| 43 | &dma0 21>; /* write channel */ | |
| 44 | dma-names = "rx", "tx"; | |
| 45 | }; | |
| 46 |