RE: Xilinx SYSACE driver and 8-bit attachment

[John Linn]

> -----Original Message-----
> From: John Linn
> Sent: Wednesday, October 07, 2009 8:24 AM
> To: 'Grant Likely'; John Williams
> Cc: Linux Kernel list; Michal Simek; David DeBonis; Stephen Neuendorffer; devicetree-discuss
> 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@xxxxxxxxxxxx [mailto:glikely@xxxxxxxxxxxx] 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@xxxxxxxxxxxxx> 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>;

Do you know if the 8 bit mode was ever tested with the "8-bit" property in the tree?

I don't see anything in the device tree generator history to say we ever did that "8-bit", but maybe I'm missing something.

We are just generating the parameters from the h/w and the memory width is it.  We can always put something in there special, but it seems silly if it was never used anyway.

Thanks,
John

> > >
> > > 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.


This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/