linux-kernel - Re: [PATCH 1/4] ARM: tegra20: Add Tegra Memory Controller(MC) driver

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Date:	Thu, 10 May 2012 11:23:55 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Hiroshi DOYU <hdoyu@...dia.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	linux-tegra@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Colin Cross <ccross@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Russell King <linux@....linux.org.uk>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Benoit Cousson <b-cousson@...com>, Aneesh V <aneesh@...com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/4] ARM: tegra20: Add Tegra Memory Controller(MC) driver

On 05/10/2012 01:42 AM, Hiroshi DOYU wrote:
> Tegra Memory Controller(MC) driver for Tegra20
> Added to support MC General interrupts, mainly for IOMMU(GART).

Greg, you appear to have been commiting all of drivers/memory. I assume
you'll take patches 1 and 3 in this series, and I will take 2 and 4
through the Tegra tree? I can take them all through the Tegra tree if
you want. Taking the .dts patches through your tree might cause
conflicts in 3.6, since I anticipate some DT-wide cleanup in 3.6.

Hiroshi, one question below (same for patch 3)

> diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig

> @@ -20,6 +20,8 @@ config ARCH_TEGRA_2x_SOC
>  	select PL310_ERRATA_727915 if CACHE_L2X0
>  	select PL310_ERRATA_769419 if CACHE_L2X0
>  	select CPU_FREQ_TABLE if CPU_FREQ
> +	select MEMORY
> +	select TEGRA20_MC

Does ARCH_TEGRA_2x_SOC /have/ to select these?

I'd be inclined to drop the change to mach-tegra/Kconfig. As rationale,
the code works fine without the driver right now. You'd need to make
config TEGRA*_MC user-visible/selectable though.

You could replace this change with a patch to tegra_defconfig which
enables MEMORY and TEGRA*_MC, or perhaps make config TEGRA20_MC default y.

What are people's thoughts here?

Aside from this, the series looks fine to me.
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