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Diffstat (limited to 'Documentation/devicetree/bindings/dma/owl-dma.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/dma/owl-dma.txt | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/owl-dma.txt b/Documentation/devicetree/bindings/dma/owl-dma.txt new file mode 100644 index 000000000..03e9bb12b --- /dev/null +++ b/Documentation/devicetree/bindings/dma/owl-dma.txt @@ -0,0 +1,47 @@ +* Actions Semi Owl SoCs DMA controller + +This binding follows the generic DMA bindings defined in dma.txt. + +Required properties: +- compatible: Should be "actions,s900-dma". +- reg: Should contain DMA registers location and length. +- interrupts: Should contain 4 interrupts shared by all channel. +- #dma-cells: Must be <1>. Used to represent the number of integer + cells in the dmas property of client device. +- dma-channels: Physical channels supported. +- dma-requests: Number of DMA request signals supported by the controller. + Refer to Documentation/devicetree/bindings/dma/dma.txt +- clocks: Phandle and Specifier of the clock feeding the DMA controller. + +Example: + +Controller: + dma: dma-controller@e0260000 { + compatible = "actions,s900-dma"; + reg = <0x0 0xe0260000 0x0 0x1000>; + interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 59 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 60 IRQ_TYPE_LEVEL_HIGH>; + #dma-cells = <1>; + dma-channels = <12>; + dma-requests = <46>; + clocks = <&clock CLK_DMAC>; + }; + +Client: + +DMA clients connected to the Actions Semi Owl SoCs DMA controller must +use the format described in the dma.txt file, using a two-cell specifier +for each channel. + +The two cells in order are: +1. A phandle pointing to the DMA controller. +2. The channel id. + +uart5: serial@e012a000 { + ... + dma-names = "tx", "rx"; + dmas = <&dma 26>, <&dma 27>; + ... +}; |