linux-kernel - Re: [PATCH v7 5/6] Documentation: dt-bindings: pci: altera pcie device tree binding

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Message-ID: <6497772.rqSurELzER@wuerfel>
Date:	Fri, 02 Oct 2015 23:56:37 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	Marc Zyngier <marc.zyngier@....com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v7 5/6] Documentation: dt-bindings: pci: altera pcie device tree binding

On Friday 02 October 2015 15:53:44 Ley Foon Tan wrote:
> > Strictly speaking, if you have undocumented bindings downstream that
> > is your problem and we don't have to accept them as-is upstream. I'm
> > not going to worry about that here.
> >
> >>> txs contains the config space?
> >> It is not the config space, but a memory slave port.
> >
> > Then where is the config space? It should not be part of "ranges" is
> > all I care about.
> The config space is not part of "ranges". Our IP uses TLP packet to
> access config space.
> 

It took me a bit to figure out what you mean here. To save others
from reading the source, here is what I found:

* The config space is accessed indirectly through registers from the
  "cra" register range, which is the right approach according to the
  point that Rob made.
* hardware-wise this basically looks like bit-banged PCIe, which is
  both awesome and scary ;-)

	Arnd
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