linux-kernel - Re: [PATCH v3 1/2] doc: Add bindings document for Xilinx LogiCore PR Decoupler

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Message-ID: <CANk1AXSHimnjsMsCJwbtwrkRppFCRxY7KQemFikgu+hqCTiO5Q@mail.gmail.com>
Date:   Fri, 24 Mar 2017 12:25:25 -0500
From:   Alan Tull <delicious.quinoa@...il.com>
To:     Moritz Fischer <moritz.fischer.private@...il.com>
Cc:     Rob Herring <robh@...nel.org>, Moritz Fischer <mdf@...nel.org>,
        linux-fpga@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michal Simek <michal.simek@...inx.com>,
        Sören Brinkmann <soren.brinkmann@...inx.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] doc: Add bindings document for Xilinx LogiCore PR Decoupler

On Fri, Mar 24, 2017 at 10:23 AM, Moritz Fischer
<moritz.fischer.private@...il.com> wrote:
> On Fri, Mar 24, 2017 at 09:59:08AM -0500, Rob Herring wrote:
>> On Fri, Mar 17, 2017 at 01:11:12PM -0700, Moritz Fischer wrote:
>> > This adds the binding documentation for the Xilinx LogiCORE PR
>> > Decoupler soft core.
>> >
>> > Signed-off-by: Moritz Fischer <mdf@...nel.org>
>> > Cc: Michal Simek <michal.simek@...inx.com>
>> > Cc: Sören Brinkmann <soren.brinkmann@...inx.com>
>> > Cc: linux-kernel@...r.kernel.org
>> > Cc: devicetree@...r.kernel.org
>> > ---
>> >
>> > Changes from v2:
>> > - Added refence to generic fpga-region bindings
>> > - Fixed up reg property in example
>> > - Added fallback to "xlnx,pr-decoupler" without version
>> >
>> > Changes from v1:
>> > - Added clock names & clock to example
>> > - Merged some of the description from Michal's version
>> >
>> > ---
>> >  .../bindings/fpga/xilinx-pr-decoupler.txt          | 35 ++++++++++++++++++++++
>> >  1 file changed, 35 insertions(+)
>> >  create mode 100644 Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt
>> >
>> > diff --git a/Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt b/Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt
>> > new file mode 100644
>> > index 0000000..16141bd
>> > --- /dev/null
>> > +++ b/Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt
>> > @@ -0,0 +1,35 @@
>> > +Xilinx LogiCORE Partial Reconfig Decoupler Softcore
>> > +
>> > +The Xilinx LogiCORE Partial Reconfig Decoupler manages one or more
>> > +decouplers / fpga bridges.
>> > +The controller can decouple/disable the bridges which prevents signal
>> > +changes from passing through the bridge.  The controller can also
>> > +couple / enable the bridges which allows traffic to pass through the
>> > +bridge normally.
>> > +
>> > +The Driver supports only MMIO handling. A PR region can have multiple
>> > +PR Decouples which can bhe handled independently or chaines via decouple/
>>
>> s/chaines/chains/
>
> Fixed in v4.
>
>> > +decouple_status signals.
>> > +
>> > +Required properties:
>> > +- compatible               : Should contain "xlnx,pr-decoupler-1.00"
>> > +- regs                     : base address and size for decoupler module
>> > +- clocks           : input clock to IP
>> > +- clock-names              : should contain "aclk"
>> > +
>> > +Optional properties:
>> > +- bridge-enable            : 0 if driver should disable bridge at startup
>> > +                     1 if driver should enable bridge at startup
>> > +                     Default is to leave bridge in current state.
>>
>> This is common and should move into a common doc. Maybe fpga-region.txt
>> works?
>
> Ok will add patch for that to v5 series.

Arg, our emails criss-crossed.  I've already sent v4 to Greg.  I hope
we don't need v5 for this one thing.  bridge-enable is common for the
fpga bridges (altera-fpga2sdram-bridge.txt, altera-freeze-bridge.txt,
altera-hps2fpga-bridge.txt, xilinx-pr-decoupler.txt).  Probably we
need a new patch to move this common bridges binding from all the
above to fpga-region.txt or create a new fpga-bridges.txt.  At first
blush, I prefer the later.

Alan


>
> Thanks for your feedback,
>
> Moritz