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

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Date:	Fri, 2 Oct 2015 15:53:44 +0800
From:	Ley Foon Tan <lftan@...era.com>
To:	Rob Herring <robh@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	Marc Zyngier <marc.zyngier@....com>,
	Arnd Bergmann <arnd@...db.de>,
	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 Tue, Sep 29, 2015 at 1:31 AM, Rob Herring <robh@...nel.org> wrote:
> On Mon, Sep 28, 2015 at 12:38 AM, Ley Foon Tan <lftan@...era.com> wrote:
>> On Sat, Sep 26, 2015 at 11:55 AM, Rob Herring <robh@...nel.org> wrote:
>>>
>>> On 09/20/2015 09:13 PM, Ley Foon Tan wrote:
>>> > This patch adds the bindings for Altera PCIe host controller driver and
>>> > Altera PCIe MSI driver.
>
> [...]
>
>>> > +     num-vectors = <32>;
>>> > +};
>>> > diff --git a/Documentation/devicetree/bindings/pci/altera-pcie.txt b/Documentation/devicetree/bindings/pci/altera-pcie.txt
>>> > new file mode 100644
>>> > index 0000000..4440db1
>>> > --- /dev/null
>>> > +++ b/Documentation/devicetree/bindings/pci/altera-pcie.txt
>>> > @@ -0,0 +1,49 @@
>>> > +* Altera PCIe controller
>>> > +
>>> > +Required properties:
>>> > +- compatible :       should contain "altr,pcie-root-port-1.0"
>>> > +- reg:               a list of physical base address and length for TXS and CRA.
>>> > +- reg-names: must include the following entries:
>>> > +             "Txs" or "txs": TX slave port region
>>> > +             "Cra" or "cra": Control register access region
>>>
>>> Why both cases? Can we please just have one (or none is better IMO).
>> The PCIe IP on different device families use different register names.
>> And our device tree generator will auto generate the register names
>> based on the hardware description name. Too bad we can't change the
>> hardware description names now.
>
> Okay, your problem to maintain. Hopefully the driver just goes by index then.
Okay, we will fix our generator tool to standardize one reg-name case
and driver  just use one reg-name case as well.
>
> 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.

Regards
Ley Foon
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