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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/contrib/device-tree/Bindings/dma/lpc1850-dmamux.txt
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NXP LPC18xx/43xx DMA MUX (DMA request router)

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Required properties:

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- compatible:	"nxp,lpc1850-dmamux"

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- reg:		Memory map for accessing module

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- #dma-cells:	Should be set to <3>.

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		* 1st cell contain the master dma request signal

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		* 2nd cell contain the mux value (0-3) for the peripheral

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		* 3rd cell contain either 1 or 2 depending on the AHB

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		  master used.

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- dma-requests:	Number of DMA requests for the mux

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- dma-masters:	phandle pointing to the DMA controller

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The DMA controller node need to have the following poroperties:

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- dma-requests:	Number of DMA requests the controller can handle

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Example:

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dmac: dma@40002000 {

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	compatible = "nxp,lpc1850-gpdma", "arm,pl080", "arm,primecell";

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	arm,primecell-periphid = <0x00041080>;

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	reg = <0x40002000 0x1000>;

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	interrupts = <2>;

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	clocks = <&ccu1 CLK_CPU_DMA>;

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	clock-names = "apb_pclk";

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	#dma-cells = <2>;

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	dma-channels = <8>;

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	dma-requests = <16>;

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	lli-bus-interface-ahb1;

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	lli-bus-interface-ahb2;

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	mem-bus-interface-ahb1;

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	mem-bus-interface-ahb2;

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	memcpy-burst-size = <256>;

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	memcpy-bus-width = <32>;

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};

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dmamux: dma-mux {

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	compatible = "nxp,lpc1850-dmamux";

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	#dma-cells = <3>;

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	dma-requests = <64>;

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	dma-masters = <&dmac>;

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};

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uart0: serial@40081000 {

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	compatible = "nxp,lpc1850-uart", "ns16550a";

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	reg = <0x40081000 0x1000>;

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	reg-shift = <2>;

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	interrupts = <24>;

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	clocks = <&ccu2 CLK_APB0_UART0>, <&ccu1 CLK_CPU_UART0>;

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	clock-names = "uartclk", "reg";

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	dmas = <&dmamux 1 1 2

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		&dmamux 2 1 2>;

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	dma-names = "tx", "rx";

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};

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