linux-kernel - RE: Xilinx SYSACE driver and 8-bit attachment

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Date:	Wed, 7 Oct 2009 08:24:28 -0600
From:	John Linn <John.Linn@...inx.com>
To:	"Grant Likely" <grant.likely@...retlab.ca>,
	"John Williams" <john.williams@...alogix.com>
CC:	"Linux Kernel list" <linux-kernel@...r.kernel.org>,
	"Michal Simek" <michal.simek@...alogix.com>,
	"David DeBonis" <ddeboni@...inx.com>,
	"Stephen Neuendorffer" <stephenn@...inx.com>,
	"devicetree-discuss" <devicetree-discuss@...ts.ozlabs.org>
Subject: RE: Xilinx SYSACE driver and 8-bit attachment

I'll look to see if something has changed.  It's not clear to me if it has ever been right.

It look like we normally use 16 bit mode as that's how BSB generates the system by default.

Thanks,
John

> -----Original Message-----
> From: glikely@...retlab.ca [mailto:glikely@...retlab.ca] On Behalf Of Grant Likely
> Sent: Wednesday, October 07, 2009 7:35 AM
> To: John Williams
> Cc: Linux Kernel list; Michal Simek; John Linn; David DeBonis; Stephen Neuendorffer; devicetree-
> discuss
> Subject: Re: Xilinx SYSACE driver and 8-bit attachment
> 
> [Added devicetree-discuss to cc: list]
> 
> On Wed, Oct 7, 2009 at 1:13 AM, John Williams
> <john.williams@...alogix.com> wrote:
> > Hi Grant (it's your driver :) and David D ( and your DTS generator :)
> [...]
> > if (of_find_property(op->node, "8-bit", NULL))
> [...]
> > doesn't match the properties generated by Xilinx's device tree generator:
> [...]
> >                         xlnx,mem-width = <0x8>;
> >
> > So, the question is, which should change?
> 
> Well, obviously its a device tree generator bug, the driver code is
> perfect.  :-P
> 
> In all seriousness though, the '8-bit' property has been present for a
> while now and needs to be retained to not break existing users.  It
> would be okay for the driver to be modified to *also* check for the
> xlnx,mem-width property, but the better solution is to modify the
> device tree generator.  Plus, the '8-bit' property is the documented
> binding in Documentation/powerpc/dts-bindings/xilinx.txt
> 
> Cheers,
> g.
> 
> --
> Grant Likely, B.Sc., P.Eng.
> Secret Lab Technologies Ltd.


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