linux-kernel - Re: [PATCH 03/11] x86/dtb: Add a device tree for CE4100

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Message-ID: <4CF4E54D.5040403@linutronix.de>
Date:	Tue, 30 Nov 2010 12:51:41 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Mitch Bradley <wmb@...mworks.com>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Scott Wood <scottwood@...escale.com>, sodaville@...utronix.de,
	x86@...nel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/11] x86/dtb: Add a device tree for CE4100

Mitch Bradley wrote:
> Here are the properties for PCI and ISA on the OLPC XO-1.5
> platform (Via C7 x86 CPU with Via VX855 IO chip):
> 
> ok dev /pci/isa
> ok .properties
> reg                      00008800 00000000 00000000 00000000 00000000

> Note that the PCI node has no reg property.  On a system with multiple independent PCI buses at the top level, it would be necessary to distinguish them with reg properties reflecting their different addresses in the root address space.  PC-style architectures typically (always?) have a single top-level PCI domain, so I've never never needed to do that in x86 land.  It used to be pretty common on PPC "big iron".

My PCI node does not have a reg property but its child nodes.
In x86_of_pci_init() [0] I walk through the PCI child nodes, read the reg
property of each node  which gives me the devfn of the device. I pass this
pci_get_slot() and get the pci_dev struct where I attach the of_node. So
it can by used by the pci driver.

How do I create the PCI device <-> OF node mapping with this? I think your
isa node has this as well. 00008800 is the devfn and I simply forgot the
four blocks of zeros.

[0] http://lkml.org/lkml/2010/11/25/294

Sebastian
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