linux-kernel - Re: [PATCH v2] PCI: generic: Add support for Cavium ThunderX PCIe root complexes.

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Date:	Wed, 23 Sep 2015 09:51:30 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org, Will Deacon <will.deacon@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	Marc Zyngier <marc.zyngier@....com>,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v2] PCI: generic: Add support for Cavium ThunderX PCIe root complexes.

On Tuesday 22 September 2015 17:16:55 David Daney wrote:
> From: David Daney <david.daney@...ium.com>
> 
> The config space for external PCIe root complexes on some Cavium
> ThunderX SoCs is very similar to CAM and ECAM, but differs in the
> shift values that have to be applied to the bus and devfn numbers to
> compose that address window offset.  These root complexes also have
> the interesting property that there is no root bridge, so the standard
> manner of limiting scanning to only the first device doesn't work.  We
> can use the standard pci-host-generic driver if we make a minor
> addition to handle these differences, so we...
> 
> Add a mapping function for ThunderX PCIe root complexes with a bus
> shift of 24 and devfn shift of 16.  Ignore accesses for devices other
> than the first device on the primary bus.
> 
> Document the whole thing in devicetree/bindings/pci/host-generic-pci.txt
> 
> Signed-off-by: David Daney <david.daney@...ium.com>
> Acked-by: Will Deacon <will.deacon@....com>
> 

Acked-by: Arnd Bergmann <arnd@...db.de>
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