From: Arnd Bergmann <arnd@arndb.de>
To: linuxppc-dev@ozlabs.org
Cc: Roderick Colenbrander <thunderbird2k@gmail.com>,
John Linn <John.Linn@xilinx.com>
Subject: Re: Musings on PCI busses
Date: Tue, 19 May 2009 18:12:02 +0200 [thread overview]
Message-ID: <200905191812.03347.arnd@arndb.de> (raw)
In-Reply-To: <fa686aa40905190828x251765dek586f5bf8e73e4cf7@mail.gmail.com>
On Tuesday 19 May 2009, Grant Likely wrote:
> 1) Probe the host controller in an of_platform driver. =A0This has the
> advantage of simplicity. =A0The probe routine will get automatically
> called when the PCI host controller device tree node is registered
> with the of_platform bus. =A0The bus parenthood also gets reflected in
> the device model and sysfs. =A0The disadvantage is that it defers PCI
> bus probing until after the of_platform bus is probed (maybe this is
> okay; maybe this already happens anyway).
This is also what we do on 64-bit systems (well, Cell at this time).
There are no fundamental problems with this, just some slightly
unexpected interactions e.g. when you have use a PCI serial port
as your console before probing PCI.
Making CONFIG_PPC_OF_PLATFORM_PCI probably requires some more
consolidation between pci_32.c and pci_64.c, but I'd consider
this a good thing.
Arnd <><
next prev parent reply other threads:[~2009-05-19 16:12 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-19 15:28 Musings on PCI busses Grant Likely
2009-05-19 16:12 ` Arnd Bergmann [this message]
2009-05-19 19:05 ` David Miller
2009-05-19 20:02 ` Grant Likely
2009-05-20 5:33 ` Benjamin Herrenschmidt
2009-05-19 16:25 ` Stephen Neuendorffer
2009-05-19 16:30 ` Grant Likely
2009-05-20 3:02 ` Benjamin Herrenschmidt
2009-05-20 3:17 ` Grant Likely
2009-05-20 5:31 ` Benjamin Herrenschmidt
2009-05-20 3:01 ` Benjamin Herrenschmidt
2009-05-20 5:51 ` David Miller
2009-05-20 6:51 ` Benjamin Herrenschmidt
2009-05-20 19:24 ` David Miller
2009-05-20 20:06 ` Grant Likely
2009-05-20 21:59 ` Benjamin Herrenschmidt
2009-05-20 22:28 ` Grant Likely
2009-05-20 22:41 ` David Miller
2009-05-20 22:49 ` Benjamin Herrenschmidt
2009-05-20 21:56 ` Benjamin Herrenschmidt
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