projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| df48f3ff JE |
1 | NXP LPC18xx/43xx DMA MUX (DMA request router) |
| 2 | ||
| 3 | Required properties: | |
| 4 | - compatible: "nxp,lpc1850-dmamux" | |
| 5 | - reg: Memory map for accessing module | |
| 6 | - #dma-cells: Should be set to <3>. | |
| 7 | * 1st cell contain the master dma request signal | |
| 8 | * 2nd cell contain the mux value (0-3) for the peripheral | |
| 9 | * 3rd cell contain either 1 or 2 depending on the AHB | |
| 10 | master used. | |
| 11 | - dma-requests: Number of DMA requests for the mux | |
| 12 | - dma-masters: phandle pointing to the DMA controller | |
| 13 | ||
| 14 | The DMA controller node need to have the following poroperties: | |
| 15 | - dma-requests: Number of DMA requests the controller can handle | |
| 16 | ||
| 17 | Example: | |
| 18 | ||
| 19 | dmac: dma@40002000 { | |
| 20 | compatible = "nxp,lpc1850-gpdma", "arm,pl080", "arm,primecell"; | |
| 21 | arm,primecell-periphid = <0x00041080>; | |
| 22 | reg = <0x40002000 0x1000>; | |
| 23 | interrupts = <2>; | |
| 24 | clocks = <&ccu1 CLK_CPU_DMA>; | |
| 25 | clock-names = "apb_pclk"; | |
| 26 | #dma-cells = <2>; | |
| 27 | dma-channels = <8>; | |
| 28 | dma-requests = <16>; | |
| 29 | lli-bus-interface-ahb1; | |
| 30 | lli-bus-interface-ahb2; | |
| 31 | mem-bus-interface-ahb1; | |
| 32 | mem-bus-interface-ahb2; | |
| 33 | memcpy-burst-size = <256>; | |
| 34 | memcpy-bus-width = <32>; | |
| 35 | }; | |
| 36 | ||
| 37 | dmamux: dma-mux { | |
| 38 | compatible = "nxp,lpc1850-dmamux"; | |
| 39 | #dma-cells = <3>; | |
| 40 | dma-requests = <64>; | |
| 41 | dma-masters = <&dmac>; | |
| 42 | }; | |
| 43 | ||
| 44 | uart0: serial@40081000 { | |
| 45 | compatible = "nxp,lpc1850-uart", "ns16550a"; | |
| 46 | reg = <0x40081000 0x1000>; | |
| 47 | reg-shift = <2>; | |
| 48 | interrupts = <24>; | |
| 49 | clocks = <&ccu2 CLK_APB0_UART0>, <&ccu1 CLK_CPU_UART0>; | |
| 50 | clock-names = "uartclk", "reg"; | |
| 51 | dmas = <&dmamux 1 1 2 | |
| 52 | &dmamux 2 1 2>; | |
| 53 | dma-names = "tx", "rx"; | |
| 54 | }; |