linux-kernel - Re: [PATCH v3 6/6] dt-bindings: fpga: Add bindings for ZynqMP fpga driver

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Date:   Fri, 22 Feb 2019 14:30:38 -0600
From:   Rob Herring <robh@...nel.org>
To:     Nava kishore Manne <navam@...inx.com>
Cc:     "mark.rutland@....com" <mark.rutland@....com>,
        Michal Simek <michals@...inx.com>,
        Rajan Vaja <RAJANV@...inx.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Jolly Shah <JOLLYS@...inx.com>,
        "chinnikishore369@...il.com" <chinnikishore369@...il.com>
Subject: Re: [PATCH v3 6/6] dt-bindings: fpga: Add bindings for ZynqMP fpga driver

On Wed, Jan 23, 2019 at 2:46 PM Nava kishore Manne <navam@...inx.com> wrote:
>
> Hi Rob,
>
>
>
> Thanks for providing the comments...

Please fix your mailer to send plain text emails to mail lists.


> > -----Original Message-----
>
> > From: Rob Herring [mailto:robh@...nel.org]
>
> > Sent: Monday, January 21, 2019 9:19 PM
>
> > To: Nava kishore Manne <navam@...inx.com>
>
> > Cc: mark.rutland@....com; Michal Simek <michals@...inx.com>; Rajan Vaja
>
> > <RAJANV@...inx.com>; linux-arm-kernel@...ts.infradead.org; linux-
>
> > kernel@...r.kernel.org; devicetree@...r.kernel.org; Jolly Shah
>
> > <JOLLYS@...inx.com>; chinnikishore369@...il.com
>
> > Subject: Re: [PATCH v3 6/6] dt-bindings: fpga: Add bindings for ZynqMP fpga
>
> > driver
>
> >
>
> > On Mon, Jan 21, 2019 at 11:08:35PM +0530, Nava kishore Manne wrote:
>
> > > Add documentation to describe Xilinx ZynqMP fpga driver bindings.
>
> > >
>
> > > Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
>
> > > ---
>
> > > Changes for v3:
>
> > >                         -Removed PCAP as a child node to the FW and Created
>
> > >                         an independent node since PCAP driver is a consumer
>
> > >                         not a provider.
>
> > >
>
> > >  .../bindings/fpga/xlnx,zynqmp-pcap-fpga.txt         | 13 +++++++++++++
>
> > >  1 file changed, 13 insertions(+)
>
> > >  create mode 100644
>
> > > Documentation/devicetree/bindings/fpga/xlnx,zynqmp-pcap-fpga.txt
>
> > >
>
> > > diff --git
>
> > > a/Documentation/devicetree/bindings/fpga/xlnx,zynqmp-pcap-fpga.txt
>
> > > b/Documentation/devicetree/bindings/fpga/xlnx,zynqmp-pcap-fpga.txt
>
> > > new file mode 100644
>
> > > index 000000000000..1f6f58872311
>
> > > --- /dev/null
>
> > > +++ b/Documentation/devicetree/bindings/fpga/xlnx,zynqmp-pcap-fpga.txt
>
> > > @@ -0,0 +1,13 @@
>
> > > +Device Tree zynqmp-fpga bindings for the Zynq Ultrascale+ MPSoC
>
> > > +controlled using ZynqMP SoC firmware interface For Bitstream
>
> > > +configuration on ZynqMp Soc uses processor configuration
>
> > > +port(PCAP) to configure the programmable logic(PL) through PS by
>
> > > +using FW interface.
>
> > > +
>
> > > +Required properties:
>
> > > +- compatible: should contain "xlnx,zynqmp-pcap-fpga"
>
> > > +
>
> > > +Example:
>
> > > +      zynqmp_pcap: pcap {
>
> > > +                     compatible = "xlnx,zynqmp-pcap-fpga";
>
> > > +      };
>
> >
>
> > There's no need for a DT node. Just make the firware driver create a platform
>
> > device for pcap.
>
> >
>
>
>
> This driver being used by the FPGA manager framework(fpga-region) to apply overlay's so this node is needed AFAIK.

The binding says nothing about child nodes and what they are. Please
define that.

Rob