linux-kernel - RE: [PATCH 3/6] dt-bindings: xilinx_dma: add required xlnx,lengthregwidth property

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Message-ID: <DM6PR02MB43617C120779E4BF0CF9FBEAC7770@DM6PR02MB4361.namprd02.prod.outlook.com>
Date:   Wed, 20 Jun 2018 14:37:00 +0000
From:   Radhey Shyam Pandey <radheys@...inx.com>
To:     'Andrea Merello' <andrea.merello@...il.com>,
        "'vkoul@...nel.org'" <vkoul@...nel.org>,
        "'dan.j.williams@...el.com'" <dan.j.williams@...el.com>,
        Michal Simek <michals@...inx.com>,
        Appana Durga Kedareswara Rao <appanad@...inx.com>,
        "'dmaengine@...r.kernel.org'" <dmaengine@...r.kernel.org>
CC:     "'linux-arm-kernel@...ts.infradead.org'" 
        <linux-arm-kernel@...ts.infradead.org>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/6] dt-bindings: xilinx_dma: add required
 xlnx,lengthregwidth property

> -----Original Message-----
> From: Radhey Shyam Pandey
> Sent: Wednesday, June 20, 2018 7:13 PM
> To: Andrea Merello <andrea.merello@...il.com>; vkoul@...nel.org;
> dan.j.williams@...el.com; Michal Simek <michals@...inx.com>; Appana Durga
> Kedareswara Rao <appanad@...inx.com>; dmaengine@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
> Subject: RE: [PATCH 3/6] dt-bindings: xilinx_dma: add required
> xlnx,lengthregwidth property
> 
> 
> > -----Original Message-----
> > From: dmaengine-owner@...r.kernel.org [mailto:dmaengine-
> > owner@...r.kernel.org] On Behalf Of Andrea Merello
> > Sent: Wednesday, June 20, 2018 2:07 PM
> > To: vkoul@...nel.org; dan.j.williams@...el.com; Michal Simek
> > <michals@...inx.com>; Appana Durga Kedareswara Rao
> > <appanad@...inx.com>; dmaengine@...r.kernel.org
> > Cc: linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> > Andrea Merello <andrea.merello@...il.com>
> > Subject: [PATCH 3/6] dt-bindings: xilinx_dma: add required
> > xlnx,lengthregwidth property
> 
> dt-bindings: dmaengine: xilinx_dma
> 
> Please also include DT folks.
> >
> > The width of the "length register" cannot be autodetected, and it is now
> > specified with a DT property. Add DOC for it.
> >
> > Signed-off-by: Andrea Merello <andrea.merello@...il.com>
> > ---
> >  Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
> > b/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
> > index a2b8bfaec43c..acecdc5d8d47 100644
> > --- a/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
> > +++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
> > @@ -36,6 +36,8 @@ Required properties:
> >
> >  Required properties for VDMA:
> >  - xlnx,num-fstores: Should be the number of framebuffers as configured in
> > h/w.
> > +Required properties for AXI DMA:
> > +- xlnx,lengthregwidth: Should be the width of the length register as
> > configured in h/w.
> 
> One suggestion to be inline with IP property naming we can rename
> this prop to "xlnx,sg-length-width"? Please take a look at Xilinx tree
> we have this feature added in the master branch. It would be good
> to consolidate both implementations and upstream. Let me know
> if there are any followup queries.

It should be ok to cherrypick 3/6 and 4/6 (xlnx,sg-length-width)
from Xilinx tree and include it in your v2 patch series. 

> 
> >
> >  Optional properties:
> >  - xlnx,include-sg: Tells configured for Scatter-mode in
> > --
> > 2.17.1
> >
> > --
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