linux-kernel - Re: [PATCH v2 1/3] ARM: tegra: Add AHB driver

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Date:	Wed, 25 Apr 2012 12:15:22 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	balbi@...com
Cc:	Hiroshi Doyu <hdoyu@...dia.com>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Colin Cross <ccross@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH v2 1/3] ARM: tegra: Add AHB driver

On Wednesday 25 April 2012, Felipe Balbi wrote:
>   On Wed, Apr 25, 2012 at 08:37:47AM +0300, Hiroshi Doyu wrote:
> > On Tue, 24 Apr 2012 21:56:45 +0200
> > Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> > 
> > > On Tue, Apr 24, 2012 at 03:05:14PM +0300, Hiroshi DOYU wrote:
> > > > The AHB Bus conforms to the AMBA Specification (Rev 2.0) Advanced
> > > > High-performance Bus (AHB) architecture.
> > > > 
> > > > The AHB Arbiter controls AHB bus master arbitration. This effectively
> > > > forms a second level of arbitration for access to the memory
> > > > controller through the AHB Slave Memory device. The AHB pre-fetch
> > > > logic can be configured to enhance performance for devices doing
> > > > sequential access. Each AHB master is assigned to either the high or
> > > > low priority bin. Both Tegra20/30 have this AHB bus.
> > > > 
> > > > Signed-off-by: Hiroshi DOYU <hdoyu@...dia.com>
> > > > Cc: Felipe Balbi <balbi@...com>
> > > > Cc: Arnd Bergmann <arnd@...db.de>
> > > > ---
> > > > Update:
> > > > - Use platform_device to get info from dt dynamically.(Felipe/Arnd)
> > > > ---
> > > >  arch/arm/mach-tegra/Makefile    |    1 +
> > > >  arch/arm/mach-tegra/tegra-ahb.c |  285 +++++++++++++++++++++++++++++++++++++++
> > > >  2 files changed, 286 insertions(+), 0 deletions(-)
> > > 
> > > 1. I thought we weren't going to have any more drivers under
> > >    arch/arm
> > 
> > Can this driver be located under "drivers/misc"? Or is there any better place?
> 
> maybe drivers/platform/arm/ ??

I really wouldn't want to add that directory: It has the risk of letting
people add random crap there that may or may not be related to ARM (the
company) and/or ARM (the architecture).

I think it could go into drivers/amba/ along with the primecell bus driver.
The two drivers are for two different aspects of the AMBA spec and don't
actually depend on one another as far as I can tell, but it's at least
a fitting name, and it doesn't depend on the ARM architecture, which is
important because the driver could be used on other architectures that
are connected to an AHB bus.

	Arnd
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