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Diffstat (limited to 'Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt b/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt new file mode 100644 index 000000000000..63a48928f3a8 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt @@ -0,0 +1,52 @@ +Texas Instruments DMA Crossbar (DMA request router) + +Required properties: +- compatible: "ti,dra7-dma-crossbar" for DRA7xx DMA crossbar +- reg: Memory map for accessing module +- #dma-cells: Should be set to <1>. + Clients should use the crossbar request number (input) +- dma-requests: Number of DMA requests the crossbar can receive +- dma-masters: phandle pointing to the DMA controller + +The DMA controller node need to have the following poroperties: +- dma-requests: Number of DMA requests the controller can handle + +Optional properties: +- ti,dma-safe-map: Safe routing value for unused request lines + +Example: + +/* DMA controller */ +sdma: dma-controller@4a056000 { + compatible = "ti,omap4430-sdma"; + reg = <0x4a056000 0x1000>; + interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>; + #dma-cells = <1>; + dma-channels = <32>; + dma-requests = <127>; +}; + +/* DMA crossbar */ +sdma_xbar: dma-router@4a002b78 { + compatible = "ti,dra7-dma-crossbar"; + reg = <0x4a002b78 0xfc>; + #dma-cells = <1>; + dma-requests = <205>; + ti,dma-safe-map = <0>; + dma-masters = <&sdma>; +}; + +/* DMA client */ +uart1: serial@4806a000 { + compatible = "ti,omap4-uart"; + reg = <0x4806a000 0x100>; + interrupts-extended = <&gic GIC_SPI 67 IRQ_TYPE_LEVEL_HIGH>; + ti,hwmods = "uart1"; + clock-frequency = <48000000>; + status = "disabled"; + dmas = <&sdma_xbar 49>, <&sdma_xbar 50>; + dma-names = "tx", "rx"; +}; |