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Subject: RE: Xilinx SYSACE driver and 8-bit attachment
Date: Wed, 7 Oct 2009 09:18:40 -0700
In-Reply-To: <fa686aa40910070752k1b954a32v1ae6a2e5a089fc5e@mail.gmail.com>
Thread-Topic: Xilinx SYSACE driver and 8-bit attachment
Thread-Index: AcpHXeJC9zSr90w5QgK5RFl0wxcnUgACw3kg
References: <1d3f23370910070013u6307bc42hf7ab243b52d007df@mail.gmail.com> <fa686aa40910070634r4a8dcf74qdcbfb3bde3413109@mail.gmail.com> <192797ad-5dd4-4ebe-8db3-d381bb949e1e@VA3EHSMHS029.ehs.local> <fa686aa40910070752k1b954a32v1ae6a2e5a089fc5e@mail.gmail.com>
From: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
To: "Grant Likely" <grant.likely@secretlab.ca>, "John Linn" <linnj@xilinx.com>
CC: "David DeBonis" <ddeboni@xilinx.com>,
       "devicetree-discuss" <devicetree-discuss@lists.ozlabs.org>,
       "Linux Kernel list" <linux-kernel@vger.kernel.org>,
       "Michal Simek" <michal.simek@petalogix.com>,
       "John Linn" <linnj@xilinx.com>,
       "John Williams" <john.williams@petalogix.com>
Message-ID: <51ada07b-493e-4552-b79b-7a4044ae1b4c@VA3EHSMHS028.ehs.local>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 3530
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> -----Original Message-----
> From: devicetree-discuss-bounces+stephen.neuendorffer=xilinx.com@lists.ozlabs.org [mailto:devicetree-
> discuss-bounces+stephen.neuendorffer=xilinx.com@lists.ozlabs.org] On Behalf Of Grant Likely
> Sent: Wednesday, October 07, 2009 7:53 AM
> To: John Linn
> Cc: David DeBonis; Stephen Neuendorffer; devicetree-discuss; Linux Kernel list; Michal Simek; John
> Linn; John Williams
> Subject: Re: Xilinx SYSACE driver and 8-bit attachment
> 
> On Wed, Oct 7, 2009 at 8:42 AM, John Linn <John.Linn@xilinx.com> wrote:
> >> -----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@secretlab.ca [mailto:glikely@secretlab.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@petalogix.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>;
> >
> > 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.
> 
> Don't forget that Virtex and Microblaze are not the only users of this
> driver.   There is a AMCC 440 board which uses the sysace as a CF
> adapter.  8-bit was definitely tested and is in use.

In this case, I'm pretty sure this tag was never automatically generated by the DTS generator.
Personally, I think it's bad practice to always assume that the device tree generator should be modified to match what a Linux driver is expecting, however given the precedence in this case,
I agree that it might be reasonable to put a special case in to generate this.

Steve
 

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