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doc: dt: dma: add bindings for lpc1850-dmamux

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Add device tree bindings documentation for the
lpc1850-dmamux DMA router.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Joachim Eastwood 2015-07-11 14:12:07 +02:00 committed by Vinod Koul
parent e5f4ae84be
commit df48f3ff95
1 changed files with 54 additions and 0 deletions
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Documentation/devicetree/bindings/dma/lpc1850-dmamux.txt Normal file
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NXP LPC18xx/43xx DMA MUX (DMA request router)
Required properties:
- compatible: "nxp,lpc1850-dmamux"
- reg: Memory map for accessing module
- #dma-cells: Should be set to <3>.
* 1st cell contain the master dma request signal
* 2nd cell contain the mux value (0-3) for the peripheral
* 3rd cell contain either 1 or 2 depending on the AHB
master used.
- dma-requests: Number of DMA requests for the mux
- 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
Example:
dmac: dma@40002000 {
compatible = "nxp,lpc1850-gpdma", "arm,pl080", "arm,primecell";
arm,primecell-periphid = <0x00041080>;
reg = <0x40002000 0x1000>;
interrupts = <2>;
clocks = <&ccu1 CLK_CPU_DMA>;
clock-names = "apb_pclk";
#dma-cells = <2>;
dma-channels = <8>;
dma-requests = <16>;
lli-bus-interface-ahb1;
lli-bus-interface-ahb2;
mem-bus-interface-ahb1;
mem-bus-interface-ahb2;
memcpy-burst-size = <256>;
memcpy-bus-width = <32>;
};
dmamux: dma-mux {
compatible = "nxp,lpc1850-dmamux";
#dma-cells = <3>;
dma-requests = <64>;
dma-masters = <&dmac>;
};
uart0: serial@40081000 {
compatible = "nxp,lpc1850-uart", "ns16550a";
reg = <0x40081000 0x1000>;
reg-shift = <2>;
interrupts = <24>;
clocks = <&ccu2 CLK_APB0_UART0>, <&ccu1 CLK_CPU_UART0>;
clock-names = "uartclk", "reg";
dmas = <&dmamux 1 1 2
&dmamux 2 1 2>;
dma-names = "tx", "rx";
};