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

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Date:	Wed, 25 Apr 2012 08:37:47 +0300
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"Felipe Balbi" <balbi@...com>, Arnd Bergmann <arnd@...db.de>,
	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 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?

> 2. From the way you describe it above, this sounds like it should be some
>    kind of generic driver, which obtains the necessary settings to be
>    programmed into registers from (eg) DT.

Agree.
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