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<TITLE>RE: [microblaze-uclinux] [PATCH 11/11] microblaze: Kconfig: Enable drivers for Microblaze</TITLE>
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<P><FONT SIZE=2>My thinking is that these drivers are likely to be used as a group,<BR>
hence it would be nice to make it easy to get them all visible/enabled somehow.<BR>
<BR>
Steve<BR>
<BR>
-----Original Message-----<BR>
From: John Williams [<A HREF="mailto:john.williams@petalogix.com">mailto:john.williams@petalogix.com</A>]<BR>
Sent: Sun 4/19/2009 4:03 PM<BR>
To: microblaze-uclinux@itee.uq.edu.au<BR>
Cc: grant.likely@secretlab.ca; Stephen Neuendorffer; linuxppc-dev; linux-kernel@vger.kernel.org; John Linn<BR>
Subject: Re: [microblaze-uclinux] [PATCH 11/11] microblaze: Kconfig: Enable drivers for Microblaze<BR>
<BR>
On Sun, Apr 19, 2009 at 12:41 PM, Stephen Neuendorffer<BR>
<stephen.neuendorffer@gmail.com> wrote:<BR>
><BR>
><BR>
> On Fri, Apr 17, 2009 at 10:49 PM, Grant Likely <grant.likely@secretlab.ca><BR>
> wrote:<BR>
>><BR>
>> On Fri, Apr 17, 2009 at 11:06 AM, Stephen Neuendorffer<BR>
>> <stephen.neuendorffer@xilinx.com> wrote:<BR>
>> ><BR>
>> > Can we have XILINX_DRIVERS, please? That way this can also be enabled<BR>
>> > on any architecture that has FPGA peripherals.<BR>
>><BR>
>> I've thought about this more, and I'd really rather not. The list of<BR>
>> affected drivers is short and is not a large maintenance burden. I<BR>
>> don't think a list of 2 or 3 architecture selects for each driver is<BR>
>> unreasonable. A "XILINX_DRIVERS" config item doesn't really help much<BR>
>> anyway. At any given time one of these drivers may be needed on<BR>
>> another platform. ie. the SystemACE device is present on at least one<BR>
>> non-virtex, non-spartan platform.<BR>
><BR>
> Which is exactly why having it architecture dependent isn't right... All of<BR>
> these drivers<BR>
> could be needed and used on any OF-based platform. If you have a platform<BR>
> (for instance, a processor connected to an FPGA which has these peripherals<BR>
> in the FPGA) then you should be able to enable these drivers. Just my 2<BR>
> cents...<BR>
<BR>
What about the radical approach of having NO architecture<BR>
filters/selectors? Even if some random i386 user selects one of these<BR>
drivers, so what? It will still compile cleanly (if it doesn't we<BR>
have to fix it), but there'll be no platform_device_register() call in<BR>
their machine startup to actually cause driver / device binding.<BR>
<BR>
No harm, no foul. Problem goes away.<BR>
<BR>
Then, as Grant points out, the rare cases where non-Xilinx platforms<BR>
do use this stuff, they'll presumably know what they're doing and it's<BR>
their responsibility to register the appropriate platform_device<BR>
structures and make the magic happen.<BR>
<BR>
John<BR>
--<BR>
John Williams, PhD, B.Eng, B.IT<BR>
PetaLogix - Linux Solutions for a Reconfigurable World<BR>
w: www.petalogix.com p: +61-7-30090663 f: +61-7-30090663<BR>
<BR>
<BR>
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