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

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Message-ID: <4F981F6C.2050807@wwwdotorg.org>
Date:	Wed, 25 Apr 2012 09:59:40 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Arnd Bergmann <arnd@...db.de>
CC:	balbi@...com, 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>,
	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 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).

I'm not really convinced that low-level platform-specific drivers like
this shouldn't be in the arch/arm/mach-* directories.
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