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

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Date:	Mon, 5 Oct 2015 11:14:05 +0800
From:	Ley Foon Tan <lftan@...era.com>
To:	Arnd Bergmann <arnd@...db.de>
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 Sat, Oct 3, 2015 at 5:56 AM, Arnd Bergmann <arnd@...db.de> wrote:
> 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.
You are right.

> * hardware-wise this basically looks like bit-banged PCIe, which is
>   both awesome and scary ;-)
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