linux-kernel - Re: [PATCH v2 4/5] arm64: Juno: Add support for the PCIe host bridge on Juno R1

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Date:	Fri, 9 Oct 2015 12:49:32 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Liviu Dudau <Liviu.Dudau@....com>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Robin Murphy <robin.murphy@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>, Jon Medhurst <tixy@...aro.org>,
	linux-pci <linux-pci@...r.kernel.org>,
	device-tree <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/5] arm64: Juno: Add support for the PCIe host bridge
 on Juno R1

On Fri, Oct 9, 2015 at 12:04 PM, Mark Rutland <mark.rutland@....com> wrote:
> On Fri, Oct 09, 2015 at 05:57:28PM +0100, Liviu Dudau wrote:
>> Juno R1 board sports a functional PCIe host bridge that is
>> compliant with the SBSA standard found [1] here. With the right
>> firmware that initialises the XpressRICH3 controller one can
>> use the generic Host Bridge driver to use the PCIe hardware.
>>
>> Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
>>
>> [1] http://infocenter.arm.com/help/topic/com.arm.doc.den0029a/
>> ---
>>  arch/arm64/boot/dts/arm/juno-r1.dts | 20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/arm/juno-r1.dts b/arch/arm64/boot/dts/arm/juno-r1.dts
>> index c627511..a702a6b 100644
>> --- a/arch/arm64/boot/dts/arm/juno-r1.dts
>> +++ b/arch/arm64/boot/dts/arm/juno-r1.dts
>> @@ -109,7 +109,26 @@
>>
>>       #include "juno-base.dtsi"
>>
>> +     pcie-controller@...00000 {
>> +             compatible = "arm,juno-r1-pcie", "plda,xpressrich3", "pci-host-ecam-generic";
>
> Judging by a PLDA press release [1], it looks like Juno uses
> "XpressRICH3-AXI" [2] rather than "XpressRICH3 for ASIC" [3].
>
> So sorry to bikeshed the name I suggested, but it's probably best to
> s/plda,xpressrich3/plda,xpressrich3-axi/
>
> With that:
>
> Acked-by: Mark Rutland <mark.rutland@....com>
>
> I assume that can be fixed up when picking (or prior to a pull) without
> the need to repost.

Also, now these strings need to be documented. :)

I would just adding to the generic host doc.

Rob
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