RE: [PATCH v2 3/6] Documentation: DT: vdma: update binding doc for AXI DMA

From: Appana Durga Kedareswara Rao
Date: Tue Mar 29 2016 - 01:49:16 EST


Hi Rob,

> -----Original Message-----
> From: Rob Herring [mailto:robh@xxxxxxxxxx]
> Sent: Tuesday, March 29, 2016 2:23 AM
> To: Appana Durga Kedareswara Rao
> Cc: pawel.moll@xxxxxxx; mark.rutland@xxxxxxx;
> ijc+devicetree@xxxxxxxxxxxxxx; galak@xxxxxxxxxxxxxx; Michal Simek; Soren
> Brinkmann; vinod.koul@xxxxxxxxx; dan.j.williams@xxxxxxxxx; Anurag Kumar
> Vulisha; Appana Durga Kedareswara Rao; moritz.fischer@xxxxxxxxx;
> laurent.pinchart@xxxxxxxxxxxxxxxx; luis@xxxxxxxxxxxxxxxxx; Srikanth
> Vemula; Anirudha Sarangi; dmaengine@xxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH v2 3/6] Documentation: DT: vdma: update binding doc for
> AXI DMA
>
> On Sun, Mar 27, 2016 at 11:36:05PM +0530, Kedareswara rao Appana wrote:
> > This patch updates the device-tree binding doc for adding support for
> > AXI DMA.
> >
> > Signed-off-by: Kedareswara rao Appana <appanad@xxxxxxxxxx>
> > ---
> > Changes for v2:
> > ---> Modified commit message as suggested by Vinod.
> > ---> Moved the patch to forward in the series as suggested by vinod.
> >
> > .../devicetree/bindings/dma/xilinx/xilinx_vdma.txt | 22
> > +++++++++++++++++++++-
> > 1 file changed, 21 insertions(+), 1 deletion(-)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt
> > b/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt
> > index a86737c..5841421 100644
> > --- a/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt
> > +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_vdma.txt
> > @@ -3,8 +3,13 @@ It can be configured to have one channel or two
> > channels. If configured as two channels, one is to transmit to the
> > video device and another is to receive from the video device.
> >
> > +Xilinx AXI DMA engine, it does transfers between memory and AXI4
> > +stream target devices. It can be configured to have one channel or two
> channels.
> > +If configured as two channels, one is to transmit to the device and
> > +another is to receive from the device.
> > +
> > Required properties:
> > -- compatible: Should be "xlnx,axi-vdma-1.00.a"
> > +- compatible: Should be "xlnx,axi-vdma-1.00.a" or "xlnx,axi-dma-1.00.a"
>
> Why the new compatible string? This is 2 different IP blocks? If so, is there really
> much shared?

The support for the AXI DMA IP also added to the existing VDMA Linux driver
In this series of patches.

>
> > - #dma-cells: Should be <1>, see "dmas" property below
> > - reg: Should contain VDMA registers location and length.
> > - xlnx,num-fstores: Should be the number of framebuffers as configured in
> h/w.
> > @@ -59,6 +64,21 @@ axi_vdma_0: axivdma@40030000 {
> > } ;
> > } ;
> >
> > +axi_dma_0: axidma@40400000 {
>
> dma@40400000

Ok will fix in the next version

Thanks,
Kedar.

>
> > + compatible = "xlnx,axi-dma-1.00.a";
> > + #dma-cells = <1>;
> > + reg = < 0x40400000 0x10000 >;
> > + dma-channel@40400000 {
> > + compatible = "xlnx,axi-dma-mm2s-channel";
> > + interrupts = < 0 59 4 >;
> > + xlnx,datawidth = <0x40>;
> > + } ;
> > + dma-channel@40400030 {
> > + compatible = "xlnx,axi-dma-s2mm-channel";
> > + interrupts = < 0 58 4 >;
> > + xlnx,datawidth = <0x40>;
> > + } ;
> > +} ;
> >
> > * DMA client
> >
> > --
> > 2.1.2
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel