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

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Message-ID: <20120426081409.GI514@tbergstrom-lnx.Nvidia.com>
Date:	Thu, 26 Apr 2012 11:14:09 +0300
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Arnd Bergmann <arnd@...db.de>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbi@...com" <balbi@...com>,
	Rob Herring <rob.herring@...xeda.com>,
	Colin Cross <ccross@...roid.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Hiroshi Doyu <hdoyu@...dia.com>
Subject: Re: [PATCH v2 1/3] ARM: tegra: Add AHB driver

On Wed, Apr 25, 2012 at 05:59:40PM +0200, Stephen Warren wrote:
> On 04/25/2012 06:15 AM, Arnd Bergmann wrote:
> > On Wednesday 25 April 2012, Felipe Balbi wrote:
> ...
> >>> 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.
> 
> Hiroshi, is this driver for something (registers/features) that AMBA
> actually specifies? AHB might be part of AMBA (I'm not familiar enough
> to know), but I don't think this aspect of Tegra's AHB bus is part of
> any core AHB/AMBA specification, rather than being some Tegra-specific
> control over the bus (given that the registers and bits correspond to
> Tegra-specific devices on the bus).
> 

The HW controlled by this 'driver' is roughly: the AHB arbiter, glue logic
between IP blocks and the AHB bus and AHB memory controller slave. All of
these are tegra specific AFAIK. So I don't see much point in a generic
driver.

Cheers,

Peter.
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