linux-kernel - Re: [RFC PATCH] slimbus: Linux driver framework for SLIMbus.

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Message-ID: <20110816135051.GA22227@huya.qualcomm.com>
Date:	Tue, 16 Aug 2011 06:50:51 -0700
From:	David Brown <davidb@...eaurora.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Kenneth Heitke <kheitke@...eaurora.org>, davidb@...eaurora.org,
	bryanh@...eaurora.org, linux-arm-msm@...r.kernel.org,
	Sagar Dharia <sdharia@...eaurora.org>, rdunlap@...otime.net,
	rmk+kernel@....linux.org.uk, john.stultz@...aro.org,
	akpm@...ux-foundation.org, ohad@...ery.com, gregkh@...e.de,
	stefanr@...6.in-berlin.de, lethal@...ux-sh.org,
	linville@...driver.com, zajec5@...il.com,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] slimbus: Linux driver framework for SLIMbus.

On Tue, Aug 16, 2011 at 03:37:28PM +0200, Arnd Bergmann wrote:
> On Friday 12 August 2011, Mark Brown wrote:
> > On Thu, Aug 11, 2011 at 02:55:55PM +0200, Arnd Bergmann wrote:
> > > On Thursday 11 August 2011, Kenneth Heitke wrote:
> > 
> > > > +EXPORT_SYMBOL_GPL(slim_add_device);
> > 
> > > I don't think this should be exported: AFAICT, the set of slim_devices
> > > is a property of the platform, so I don't see how any other device driver
> > > would add another device.
> > 
> > The platform may be comprised of multiple hardwaare modules with
> > functionality on daughtercards which can be probed at runtime.  You may
> > also find someone constructing a PCI card or something with a slimbus
> > controller on it at some point.
> 
> This is theoretically true, but IIRC David mentioned that the bus is
> only present on few SoCs and has since been abandoned in favor of standard
> busses for new devices.

Actually, this is a different one than the one I was mentioning at the
Linaro Connect.  I believe SLIMbus is more active
http://en.wikipedia.org/wiki/SLIMbus

The other bus I was mentioning is called SSBI, which as far as I know
is only used to communicate between MSMs and certain Qualcomm
peripheral chips.

Kenneth would better be able to clarify how dynamic the SLIMbus is.

David

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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