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dmaengine: renesas,usb-dmac: Add device tree bindings documentation
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Document the device tree bindings for the Renesas USB DMA
Controller (USB-DMAC).

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Yoshihiro Shimoda authored and Vinod Koul committed Apr 2, 2015
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37 changes: 37 additions & 0 deletions Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt
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* Renesas USB DMA Controller Device Tree bindings

Required Properties:
- compatible: must contain "renesas,usb-dmac"
- reg: base address and length of the registers block for the DMAC
- interrupts: interrupt specifiers for the DMAC, one for each entry in
interrupt-names.
- interrupt-names: one entry per channel, named "ch%u", where %u is the
channel number ranging from zero to the number of channels minus one.
- clocks: a list of phandle + clock-specifier pairs.
- #dma-cells: must be <1>, the cell specifies the channel number of the DMAC
port connected to the DMA client.
- dma-channels: number of DMA channels

Example: R8A7790 (R-Car H2) USB-DMACs

usb_dmac0: dma-controller@e65a0000 {
compatible = "renesas,usb-dmac";
reg = <0 0xe65a0000 0 0x100>;
interrupts = <0 109 IRQ_TYPE_LEVEL_HIGH
0 109 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "ch0", "ch1";
clocks = <&mstp3_clks R8A7790_CLK_USBDMAC0>;
#dma-cells = <1>;
dma-channels = <2>;
};

usb_dmac1: dma-controller@e65b0000 {
compatible = "renesas,usb-dmac";
reg = <0 0xe65b0000 0 0x100>;
interrupts = <0 110 IRQ_TYPE_LEVEL_HIGH
0 110 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "ch0", "ch1";
clocks = <&mstp3_clks R8A7790_CLK_USBDMAC1>;
#dma-cells = <1>;
dma-channels = <2>;
};

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