linux-kernel - Re: [PATCH 0/2] Translate of PCI address without PCI enabled

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Message-Id: <20140220153513.747E5C4050F@trevor.secretlab.ca>
Date:	Thu, 20 Feb 2014 15:35:13 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>
Subject: Re: [PATCH 0/2] Translate of PCI address without PCI enabled

On Wed, 19 Feb 2014 21:50:28 -0300, Ezequiel Garcia <ezequiel.garcia@...e-electrons.com> wrote:
> On Wed, Feb 19, 2014 at 11:14:54PM +0100, Gregory CLEMENT wrote:
> > Hello,
> > 
> > This patch set makes the use of the of PCI address translator less
> > restrictive. At the end it will allow to use the mvebu_get_soc_id
> > unconditionally.
> > 
> > The mvebu SoC (such as Kirkwood, Dove or Armada XP for instance) come
> > with an IP of a PCI controller. The ID and the revision of a SoC are
> > stored in the registers of this controller. Being able to get this
> > information allows to deals with errata more dynamically.
> > 
> > To manage to read this information, we need to map the registers, and
> > for this we need to use the of PCI translator which depend of the PCI
> > support.
> > 
> > However there are mvebu board without any PCI devices, and where
> > selecting the PCI support would be useless.
> > 
> > Moreover translating an address from a PCI node of the device-tree
> > into a CPU physical address doesn't require the core PCI
> > support. Those translations are just related to the device tree
> > itself.
> > 
> > The 1st patch introduces a new config symbol: OF_ADDRESS_PCI, which
> > will be selected as soon as PCI will be selected, so we remains in the
> > same situation the current code. It should go to the of tree.
> > 
> > The 2nd patch selects OF_ADDRESS_PCI as soon as ARCH_MVEBU will be
> > selected. This will make mvebu_get_soc_id available even without the
> > PCI support. It should go to the mvebu tree.
> > 
> > Thanks,
> > 
> > Gregory CLEMENT (2):
> >   of: Allows to use the PCI translator without the PCI core
> >   ARM: mvebu: Allows to get the SoC ID even without PCI enabled
> > 
> >  arch/arm/mach-mvebu/Kconfig | 1 +
> >  drivers/of/Kconfig          | 4 ++++
> >  drivers/of/address.c        | 8 +++++---
> >  3 files changed, 10 insertions(+), 3 deletions(-)
> > 
> > -- 
> > 1.8.1.2
> > 
> 
> On XP GP and CONFIG_PCI=n, without the patches I get this:
> 
>   mvebu-soc-id: cannot map registers
> 
> and after applying the patches I have:
> 
>   mvebu-soc-id: MVEBU SoC ID=0x7846, Rev=0x2
> 
> Tested-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
> Reviewed-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>

Applied both, thanks.

g.

> 
> Thanks for taking care of this.
> -- 
> Ezequiel García, Free Electrons
> Embedded Linux, Kernel and Android Engineering
> http://free-electrons.com

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