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arm64: allwinner: a64: Add devicetree binding for DMA controller

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The A64 is register compatible with the H3, but has a different number
of dma channels and request ports.

Attach additional properties to the node to allow future reuse of the
compatible for controllers with different number of channels/requests.

If dma-requests is not specified, the register layout defined maximum
of 32 is used.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Stefan Brüns 2017-09-28 03:49:23 +02:00 committed by Vinod Koul
parent 500fa9e76b
commit d93cc0e788
1 changed files with 26 additions and 0 deletions
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26
Documentation/devicetree/bindings/dma/sun6i-dma.txt
View file

@ -27,6 +27,32 @@ Example:
#dma-cells = <1>;
};
------------------------------------------------------------------------------
For A64 DMA controller:
Required properties:
- compatible: "allwinner,sun50i-a64-dma"
- dma-channels: Number of DMA channels supported by the controller.
Refer to Documentation/devicetree/bindings/dma/dma.txt
- all properties above, i.e. reg, interrupts, clocks, resets and #dma-cells
Optional properties:
- dma-requests: Number of DMA request signals supported by the controller.
Refer to Documentation/devicetree/bindings/dma/dma.txt
Example:
dma: dma-controller@1c02000 {
compatible = "allwinner,sun50i-a64-dma";
reg = <0x01c02000 0x1000>;
interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&ccu CLK_BUS_DMA>;
dma-channels = <8>;
dma-requests = <27>;
resets = <&ccu RST_BUS_DMA>;
#dma-cells = <1>;
};
------------------------------------------------------------------------------
Clients:
DMA clients connected to the A31 DMA controller must use the format