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

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Date:	Thu, 03 May 2012 12:39:00 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Hiroshi DOYU <hdoyu@...dia.com>, Olof Johansson <olof@...om.net>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>
CC:	linux-tegra@...r.kernel.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, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 1/1] ARM: tegra: Add Tegra Memory Controller(MC) driver

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/?

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.

Hiroshi,

This driver attempts to cover both Tegra20 and Tegra30. However, there's
almost no common code. I think it'd be best as separate tegra20-mc.c and
tegra30-mc.c.

This patch should include DT binding documentation.

That all said, I'd hold off on reposting this until we work out how the
MC/GART/SMMU parent-child relationship stuff is worked out; see my
immediately previous email.
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