| 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"; |
| }; |