| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | * Hisilicon K3 DMA controller |
| 2 | |
| 3 | See dma.txt first |
| 4 | |
| 5 | Required properties: |
| 6 | - compatible: Must be one of |
| 7 | - "hisilicon,k3-dma-1.0" |
| 8 | - "hisilicon,hisi-pcm-asp-dma-1.0" |
| 9 | - reg: Should contain DMA registers location and length. |
| 10 | - interrupts: Should contain one interrupt shared by all channel |
| 11 | - #dma-cells: see dma.txt, should be 1, para number |
| 12 | - dma-channels: physical channels supported |
| 13 | - dma-requests: virtual channels supported, each virtual channel |
| 14 | have specific request line |
| 15 | - clocks: clock required |
| 16 | |
| 17 | Example: |
| 18 | |
| 19 | Controller: |
| 20 | dma0: dma@fcd02000 { |
| 21 | compatible = "hisilicon,k3-dma-1.0"; |
| 22 | reg = <0xfcd02000 0x1000>; |
| 23 | #dma-cells = <1>; |
| 24 | dma-channels = <16>; |
| 25 | dma-requests = <27>; |
| 26 | interrupts = <0 12 4>; |
| 27 | clocks = <&pclk>; |
| 28 | }; |
| 29 | |
| 30 | Client: |
| 31 | Use specific request line passing from dmax |
| 32 | For example, i2c0 read channel request line is 18, while write channel use 19 |
| 33 | |
| 34 | i2c0: i2c@fcb08000 { |
| 35 | compatible = "snps,designware-i2c"; |
| 36 | dmas = <&dma0 18 /* read channel */ |
| 37 | &dma0 19>; /* write channel */ |
| 38 | dma-names = "rx", "tx"; |
| 39 | }; |
| 40 | |
| 41 | i2c1: i2c@fcb09000 { |
| 42 | compatible = "snps,designware-i2c"; |
| 43 | dmas = <&dma0 20 /* read channel */ |
| 44 | &dma0 21>; /* write channel */ |
| 45 | dma-names = "rx", "tx"; |
| 46 | }; |
| 47 | |