linux-kernel - Re: [PATCH v12 5/6] ARM: socfpga: add bindings document for fpga bridge drivers

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Date:	Wed, 28 Oct 2015 10:53:17 -0500
From:	atull <atull@...nsource.altera.com>
To:	Steffen Trumtrar <s.trumtrar@...gutronix.de>
CC:	<gregkh@...uxfoundation.org>,
	Moritz Fischer <moritz.fischer@...us.com>,
	Josh Cartwright <joshc@...com>, <monstr@...str.eu>,
	<michal.simek@...inx.com>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Jonathan Corbet" <corbet@....net>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<pantelis.antoniou@...sulko.com>, <delicious.quinoa@...il.com>,
	<dinguyen@...nsource.altera.com>,
	Matthew Gerlach <mgerlach@...era.com>
Subject: Re: [PATCH v12 5/6] ARM: socfpga: add bindings document for fpga
 bridge drivers

On Wed, 28 Oct 2015, Steffen Trumtrar wrote:

> Hi!
> 
> On Tue, Oct 27, 2015 at 05:09:14PM -0500, atull@...nsource.altera.com wrote:
> > From: Alan Tull <atull@...nsource.altera.com>
> > 
> > Add bindings documentation for Altera SOCFPGA bridges:
> >  * fpga2sdram
> >  * fpga2hps
> >  * hps2fpga
> >  * lwhps2fpga
> > 
> > Signed-off-by: Alan Tull <dinguyen@...nsource.altera.com>
> > Signed-off-by: Dinh Nguyen <dinguyen@...nsource.altera.com>
> > Signed-off-by: Matthew Gerlach <mgerlach@...era.com>
> > ---
> > v2:  separate into 2 documents for the 2 drivers
> > v12: bump version to line up with simple-fpga-bus version
> >      remove Linux specific notes such as references to sysfs
> >      move non-DT specific documentation elsewhere
> >      remove bindings that would have been used to pass configuration
> >      clean up formatting
> > ---
> >  .../bindings/fpga/altera-fpga2sdram-bridge.txt     |   18 ++++++++++
> >  .../bindings/fpga/altera-hps2fpga-bridge.txt       |   36 ++++++++++++++++++++
> >  2 files changed, 54 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/fpga/altera-fpga2sdram-bridge.txt
> >  create mode 100644 Documentation/devicetree/bindings/fpga/altera-hps2fpga-bridge.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/fpga/altera-fpga2sdram-bridge.txt b/Documentation/devicetree/bindings/fpga/altera-fpga2sdram-bridge.txt
> > new file mode 100644
> > index 0000000..11eb5b7
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/fpga/altera-fpga2sdram-bridge.txt
> > @@ -0,0 +1,18 @@
> > +Altera FPGA To SDRAM Bridge Driver
> > +
> > +Required properties:
> > +- compatible		: Should contain "altr,socfpga-fpga2sdram-bridge"
> > +
> > +Optional properties:
> > +- label			: User-readable name for this bridge.
> > +			  Default is br<device#>
> > +- init-val		: 0 if driver should disable bridge at startup
> > +			  1 if driver should enable bridge at startup
> > +			  Default is to leave bridge in current state.
> 
> I know, that there are bindings, that configure via devicetree, but AFAIK
> this is not okay.

Yes there is configuration in the DT. I attended a presentation at ELC in 
Dublin 3 weeks ago - Frank Rowand on "Solving Device Tree Issues."  He said in 
addition to non-probable hardware information, it was a "dirty secret" that DT
includes configuration information and some policy.

Alan
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