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dmaengine: Add hisilicon k3 DMA engine driver
Add dmaengine driver for hisilicon k3 platform based on virt_dma Signed-off-by: Zhangfei Gao <[email protected]> Tested-by: Kai Yang <[email protected]> Acked-by: Arnd Bergmann <[email protected]> Signed-off-by: Vinod Koul <[email protected]>
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* Hisilicon K3 DMA controller | ||
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See dma.txt first | ||
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Required properties: | ||
- compatible: Should be "hisilicon,k3-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 | ||
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Example: | ||
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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>; | ||
status = "disable"; | ||
}; | ||
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Client: | ||
Use specific request line passing from dmax | ||
For example, i2c0 read channel request line is 18, while write channel use 19 | ||
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i2c0: i2c@fcb08000 { | ||
compatible = "snps,designware-i2c"; | ||
dmas = <&dma0 18 /* read channel */ | ||
&dma0 19>; /* write channel */ | ||
dma-names = "rx", "tx"; | ||
}; | ||
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i2c1: i2c@fcb09000 { | ||
compatible = "snps,designware-i2c"; | ||
dmas = <&dma0 20 /* read channel */ | ||
&dma0 21>; /* write channel */ | ||
dma-names = "rx", "tx"; | ||
}; | ||
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