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

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Date:	Fri, 11 May 2012 09:50:12 +0300
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Stephen Warren <swarren@...dotorg.org>
CC:	"linux-tegra@...r.kernel.org" <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" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/4] ARM: tegra20: Add Tegra Memory Controller(MC)
 driver

Hi Greg, Stephen,

On Thu, 10 May 2012 19:23:55 +0200
Stephen Warren <swarren@...dotorg.org> wrote:

> 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.

I'm sending the fixup patches, following this mail, since Greg has
already put the original patches in queue. I think that the following
fixup patches could be squashed into the original ones. The fixup
patches are:

  [PATCH 1/3] ARM: tegra20: Make MC optional in Kconfig
  [PATCH 2/3] ARM: tegra30: Make MC optional in Kconfig
  [PATCH 3/3] ARM: tegra: Make TEGRA{20,30}_MC selectable in defconfig

Let me know if it's better to resend the complete patches again.
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