[PATCH v4 1/2] dma: Add Xilinx Central DMA DT Binding Documentation

[Appana Durga Kedareswara Rao]

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> -----Original Message-----
> From: Kedareswara rao Appana [mailto:appana.durga.rao at xilinx.com]
> Sent: Thursday, May 21, 2015 10:40 PM
> To: robh+dt at kernel.org; pawel.moll at arm.com; mark.rutland at arm.com;
> ijc+devicetree at hellion.org.uk; Michal Simek; galak at codeaurora.org;
> appand at xilinx.com; Soren Brinkmann
> Cc: devicetree at vger.kernel.org; linux-arm-kernel at lists.infradead.org; linux-
> kernel at vger.kernel.org; Appana Durga Kedareswara Rao; Srikanth Thokala
> Subject: [PATCH v4 1/2] dma: Add Xilinx Central DMA DT Binding
> Documentation
>
> Device-tree binding documentation of Xilinx Central DMA Engine.
>
> Signed-off-by: Srikanth Thokala <sthokal at xilinx.com>
> Signed-off-by: Kedareswara rao Appana <appanad at xilinx.com>
> ---
> This patch is rebased on the commit
> Merge tag 'nfs-for-4.1-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
>
> Changes in v4:
> - None.
> Changes in v3:
> - Used proper alignment for all the properties.
> 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..d1637de
> --- /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 at 7e200000 {
> +       compatible = "xlnx,axi-cdma-1.00.a";
> +       #dma_cells = <1>;
> +       reg = < 0x7e200000 0x10000 >;
> +       dma-channel at 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 at 0 {
> +       compatible ="xlnx,axi-cdma-test-1.00.a";
> +       dmas = <&axi_cdma_0 0>;
> +       dma-names = "cdma";
> +} ;
> --
> 2.1.2



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