linux-kernel - Re: [PATCH 1/1] ARM: tegra: Add Tegra Memory Controller(MC) driver

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Message-ID: <20120504083424.0f394a6db8e95763e59ae2a0@nvidia.com>
Date:	Fri, 4 May 2012 08:34:24 +0300
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>
CC:	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Colin Cross <ccross@...roid.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH 1/1] ARM: tegra: Add Tegra Memory Controller(MC) driver

On Thu, 3 May 2012 22:13:23 +0200
Olof Johansson <olof@...om.net> wrote:

> Hi,
> 
> On Thu, May 3, 2012 at 11:39 AM, Stephen Warren <swarren@...dotorg.org> wrote:
> > On 05/03/2012 10:51 AM, Hiroshi DOYU wrote:
> >> Tegra Memory Controller(MC) driver for Tegra20/30.
> >> Added to support MC General interrupts, mainly for IOMMU.
> >
> >> The location of a file may not be suitable because of xxx_driver under arch/arm/mach-*.
> >> ---
> >> diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
> >
> > Russell, Olof, Arnd,
> >
> > Where should this driver be placed? It's a completely Tegra-specific
> > module, and I don't believe there's any drivers/ directory or other
> > subsystem that's appropriate to house it right now. Should we go ahead
> > and create a drivers/arm/ for this? Perhaps drivers/misc/?
> 
> TI just added their memory driver in drivers/memory, and it was merged
> through Greg K-H's driver tree. That would be a good location for this
> one as well.
> 
> > Honestly, to me it seems best to keep purely platform-specific drivers
> > like this in arch/arm/mach-tegra, since that's the most closely
> > Tegra-related directory.
> 
> Since tegra has a custom memory controller it's not as obvious that it
> needs to go in a shared location, indeed. But it's easier to use the
> same practices across platforms, and if there are other vendors that
> end up sharing IP blocks for memory down the road, having them in a
> common location makes sense.

I think that the above TI's patch is:

  Add TI EMIF SDRAM controller driver
    http://lwn.net/Articles/494922/

I'm moving this Tegra MC driver under drivers/memory, "tegra{20,30}-mc.c".
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