linux-kernel - Re: [PATCH] arm64/pci: Add quirks for Cavium Thunder PCI bridges.

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Message-ID: <5602CCA4.8070606@caviumnetworks.com>
Date:	Wed, 23 Sep 2015 09:00:36 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	David Daney <ddaney.cavm@...il.com>,
	<linux-kernel@...r.kernel.org>, Will Deacon <will.deacon@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	<linux-pci@...r.kernel.org>, David Daney <david.daney@...ium.com>
Subject: Re: [PATCH] arm64/pci: Add quirks for Cavium Thunder PCI bridges.

On 09/23/2015 12:51 AM, Arnd Bergmann wrote:
> On Tuesday 22 September 2015 17:09:56 David Daney wrote:
>> From: David Daney <david.daney@...ium.com>
>>
>> The Cavium ThunderX SoC needs a PCI quirk for its on-chip bridges.
>> Since it is arm64, create a new quirks.c file there to contain arm64
>> related quirks.  Add the ThunderX bridge quirk, gated by a new config
>> variable, so that it can be disabled for kernels that aren't expected
>> to be used on ThunderX.
>>
>> Signed-off-by: David Daney <david.daney@...ium.com>
>> ---
>>   arch/arm64/Kconfig         | 11 +++++++++++
>>   arch/arm64/kernel/Makefile |  2 +-
>>   arch/arm64/kernel/quirks.c | 36 ++++++++++++++++++++++++++++++++++++
>>   3 files changed, 48 insertions(+), 1 deletion(-)
>>   create mode 100644 arch/arm64/kernel/quirks.c
>>
>
> Looks reasonable to me. Just one question: Is the same bridge used
> on MIPS machines?

No.  The MIPS64 based OCTEON family of SoCs does not contain 
PCI-buses/config-space/bridges for on-chip hardware blocks.  The on-chip 
blocks in OCTEON are all platform devices.  So, ...

> If so, maybe it should be moved to drivers/pci/quirks.c
> instead for better reuse.

The quirk is specific to some arm64 based SoCs, thus my idea to have 
arch specific quirks.

David Daney


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