Messages in this thread | | | From | Appana Durga Kedareswara Rao <> | Subject | RE: [PATCH v7 1/2] Documentation: DT: dma: Add Xilinx zynqmp dma device tree binding documentation | Date | Wed, 27 Apr 2016 07:33:22 +0000 |
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Hi Lars,
> -----Original Message----- > From: Lars-Peter Clausen [mailto:lars@metafoo.de] > Sent: Wednesday, April 27, 2016 12:42 PM > To: Appana Durga Kedareswara Rao <appanad@xilinx.com>; > robh+dt@kernel.org; pawel.moll@arm.com; mark.rutland@arm.com; > ijc+devicetree@hellion.org.uk; galak@codeaurora.org; Michal Simek > <michals@xilinx.com>; Soren Brinkmann <sorenb@xilinx.com>; > vinod.koul@intel.com; dan.j.williams@intel.com; Appana Durga Kedareswara > Rao <appanad@xilinx.com>; moritz.fischer@ettus.com; > laurent.pinchart@ideasonboard.com; luis@debethencourt.com; Anirudha > Sarangi <anirudh@xilinx.com>; Punnaiah Choudary Kalluri > <punnaia@xilinx.com> > Cc: devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux- > kernel@vger.kernel.org; dmaengine@vger.kernel.org > Subject: Re: [PATCH v7 1/2] Documentation: DT: dma: Add Xilinx zynqmp dma > device tree binding documentation > > On 04/27/2016 09:05 AM, Kedareswara rao Appana wrote: > [...] > > +- xlnx,include-sg : Indicates the controller to operate in simple or > > + scatter gather dma mode > > +- xlnx,ratectrl : Scheduling interval in terms of clock cycles for > > + source AXI transaction > > +- xlnx,overfetch : Tells whether the channel is allowed to over > > + fetch the data > > +- xlnx,src-issue : Number of AXI outstanding transactions on source > side > > +- xlnx,src-burst-len : AXI length for data read. Support only power of > > + 2 byte values. > > +- xlnx,dst-burst-len : AXI length for data write. Support only power of > > These are all software runtime configuration parameters that you'd want to > change at runtime depending on which peripheral you are targeting with a > specific DMA transfer. These really do not belong into the devicetree.
You mean to have a separate config structure in the driver and handle the above parameters Through that structure???
I understand that above will work for slave dma transfer types what about memory to memory Transfers where we don't have provision to the use this parameters...
Regards, Kedar.
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