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Diffstat (limited to 'Documentation/devicetree/bindings/dma/k3dma.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/dma/k3dma.txt | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/k3dma.txt b/Documentation/devicetree/bindings/dma/k3dma.txt new file mode 100644 index 0000000000..10a2f15b08 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/k3dma.txt @@ -0,0 +1,47 @@ +* Hisilicon K3 DMA controller + +See dma.txt first + +Required properties: +- compatible: Must be one of +- "hisilicon,k3-dma-1.0" +- "hisilicon,hisi-pcm-asp-dma-1.0" +- reg: Should contain DMA registers location and length. +- interrupts: Should contain one interrupt shared by all channel +- #dma-cells: see dma.txt, should be 1, para number +- dma-channels: physical channels supported +- dma-requests: virtual channels supported, each virtual channel + have specific request line +- clocks: clock required + +Example: + +Controller: + dma0: dma@fcd02000 { + compatible = "hisilicon,k3-dma-1.0"; + reg = <0xfcd02000 0x1000>; + #dma-cells = <1>; + dma-channels = <16>; + dma-requests = <27>; + interrupts = <0 12 4>; + clocks = <&pclk>; + }; + +Client: +Use specific request line passing from dmax +For example, i2c0 read channel request line is 18, while write channel use 19 + + i2c0: i2c@fcb08000 { + compatible = "snps,designware-i2c"; + dmas = <&dma0 18 /* read channel */ + &dma0 19>; /* write channel */ + dma-names = "rx", "tx"; + }; + + i2c1: i2c@fcb09000 { + compatible = "snps,designware-i2c"; + dmas = <&dma0 20 /* read channel */ + &dma0 21>; /* write channel */ + dma-names = "rx", "tx"; + }; + |