On Thu, May 22, 2014 at 8:34 PM, Maxime Ripard <maxime.rip...@free-electrons.com> wrote: > The Allwinner A31 DMA controller is rather simple to describe in the DT. Add > the bindings documentation. > > Signed-off-by: Maxime Ripard <maxime.rip...@free-electrons.com> > --- > .../devicetree/bindings/dma/sun6i-dma.txt | 45 > ++++++++++++++++++++++ > 1 file changed, 45 insertions(+) > create mode 100644 Documentation/devicetree/bindings/dma/sun6i-dma.txt > > diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt > b/Documentation/devicetree/bindings/dma/sun6i-dma.txt > new file mode 100644 > index 000000000000..5d7c86d52665 > --- /dev/null > +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt > @@ -0,0 +1,45 @@ > +Allwinner A31 DMA Controller > + > +This driver follows the generic DMA bindings defined in dma.txt. > + > +Required properties: > + > +- compatible: Must be "allwinner,sun6i-a31-dma" > +- reg: Should contain the registers base address and length > +- interrupts: Should contain a reference to the interrupt used by this > device > +- clocks: Should contain a reference to the parent AHB clock > +- resets: Should contain a reference to the reset controller asserting > + this device in reset
Extra spaces between the leading tabs. (Gmail messes up whitespaces, please see original mail.) > +- #dma-cells : Should be 1, a single cell holding a line request number > + > +Example: > + dma: dma-controller@01c02000 { > + compatible = "allwinner,sun6i-a31-dma"; > + reg = <0x01c02000 0x1000>; > + interrupts = <0 50 4>; > + clocks = <&ahb1_gates 6>; > + resets = <&ahb1_rst 6>; > + #dma-cells = <1>; > + }; > + > +Clients: > + > +DMA clients connected to the A31 DMA controller must use the format > +described in the dma.txt file, using a two-cell specifier for each > +channel: a phandle plus one integer cells. > +The two cells in order are: > + > +1. A phandle pointing to the DMA controller. > +2. The port ID as specified in the datasheet > + > +Example: > +spi2: spi@01c6a000 { > + compatible = "allwinner,sun6i-a31-spi"; > + reg = <0x01c6a000 0x1000>; > + interrupts = <0 67 4>; > + clocks = <&ahb1_gates 22>, <&spi2_clk>; > + clock-names = "ahb", "mod"; > + dmas = <&dma 25>, <&dma 25>; > + dma-names = "rx", "tx"; > + resets = <&ahb1_rst 22>; > +}; > -- > 1.9.3 > > -- > You received this message because you are subscribed to the Google Groups > "linux-sunxi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to linux-sunxi+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.