| Message ID | 1407238791-3370-1-git-send-email-sthokal@xilinx.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Vinod Koul |
| Headers | show |
On 08/05/2014 05:09 PM, Srikanth Thokala wrote: > Device-tree binding documentation of Xilinx Central DMA Engine > > Signed-off-by: Srikanth Thokala <sthokal@xilinx.com> > --- > Changes in v2: > - Change property 'xlnx,data-width' to 'xlnx,datawidth' in the description > to match the implementation. > > --- > .../devicetree/bindings/dma/xilinx/xilinx_cdma.txt | 54 ++++++++++++++++++++ > 1 file changed, 54 insertions(+) > create mode 100644 Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt > > diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt > new file mode 100644 > index 0000000..b04f76b > --- /dev/null > +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt > @@ -0,0 +1,54 @@ > +Xilinx AXI CDMA engine, it does transfers between memory-mapped source > +address and a memory-mapped destination address. > + > +Required properties: > +- compatible: Should be "xlnx,axi-cdma-1.00.a" > +- #dma-cells: Should be <1>, see "dmas" property below > +- reg: Should contain cdma registers location and length. > +- dma-channel child node: Should have only one channel > + > + proper alignment for all the properties... Required properties: - compatible : Should be "xlnx,axi-cdma-1.00.a" - #dma-cells : Should be <1>, see "dmas" property below - reg : Should contain cdma registers location and length. .....
Hi Varka Bhadram, On Tue, Aug 5, 2014 at 5:29 PM, Varka Bhadram <varkabhadram@gmail.com> wrote: > On 08/05/2014 05:09 PM, Srikanth Thokala wrote: >> >> Device-tree binding documentation of Xilinx Central DMA Engine >> >> Signed-off-by: Srikanth Thokala <sthokal@xilinx.com> >> --- >> Changes in v2: >> - Change property 'xlnx,data-width' to 'xlnx,datawidth' in the description >> to match the implementation. >> >> --- >> .../devicetree/bindings/dma/xilinx/xilinx_cdma.txt | 54 >> ++++++++++++++++++++ >> 1 file changed, 54 insertions(+) >> create mode 100644 >> Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt >> >> diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt >> b/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt >> new file mode 100644 >> index 0000000..b04f76b >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt >> @@ -0,0 +1,54 @@ >> +Xilinx AXI CDMA engine, it does transfers between memory-mapped source >> +address and a memory-mapped destination address. >> + >> +Required properties: >> +- compatible: Should be "xlnx,axi-cdma-1.00.a" >> +- #dma-cells: Should be <1>, see "dmas" property below >> +- reg: Should contain cdma registers location and length. >> +- dma-channel child node: Should have only one channel >> + >> + > > > proper alignment for all the properties... > Required properties: > - compatible : Should be "xlnx,axi-cdma-1.00.a" > > - #dma-cells : Should be <1>, see "dmas" property below > - reg : Should contain cdma registers location and length. > ..... I would like to change, but is it documented anywhere? Because, I didn't receive any such comments on other drivers, so I am just wondering. Thanks Srikanth > > > > -- > Regards, > Varka Bhadram. > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt new file mode 100644 index 0000000..b04f76b --- /dev/null +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt @@ -0,0 +1,54 @@ +Xilinx AXI CDMA engine, it does transfers between memory-mapped source +address and a memory-mapped destination address. + +Required properties: +- compatible: Should be "xlnx,axi-cdma-1.00.a" +- #dma-cells: Should be <1>, see "dmas" property below +- reg: Should contain cdma registers location and length. +- dma-channel child node: Should have only one channel + +Optional properties: +- xlnx,include-sg: Tells whether configured for Scatter-mode in + the hardware. + +Required child node properties: +- compatible: It should be "xlnx,axi-cdma-channel". +- interrupts: Should contain per channel CDMA interrupts. +- xlnx,datawidth: Should contain the stream data width, take values + {32,64...1024}. + +Option child node properties: +- xlnx,include-dre: Tells whether hardware is configured for Data + Realignment Engine. + +Example: +++++++++ + +axi_cdma_0: axicdma@7e200000 { + compatible = "xlnx,axi-cdma-1.00.a"; + #dma_cells = <1>; + reg = < 0x7e200000 0x10000 >; + dma-channel@7e200000 { + compatible = "xlnx,axi-cdma-channel"; + interrupts = < 0 55 4 >; + xlnx,datawidth = <0x40>; + } ; +} ; + + +* DMA client + +Required properties: +- dmas: a list of <[Central DMA device phandle] [Channel ID]> pairs, + where Channel ID is '0' for write/tx and '1' for read/rx + channel. +- dma-names: a list of DMA channel names, one per "dmas" entry + +Example: +++++++++ + +cdmatest_0: cdmatest@0 { + compatible ="xlnx,axi-cdma-test-1.00.a"; + dmas = <&axi_cdma_0 0>; + dma-names = "cdma0"; +} ;
Device-tree binding documentation of Xilinx Central DMA Engine Signed-off-by: Srikanth Thokala <sthokal@xilinx.com> --- Changes in v2: - Change property 'xlnx,data-width' to 'xlnx,datawidth' in the description to match the implementation. --- .../devicetree/bindings/dma/xilinx/xilinx_cdma.txt | 54 ++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/xilinx/xilinx_cdma.txt