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

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Message-ID: <20110812164608.GC28150@sirena.org.uk>
Date:	Fri, 12 Aug 2011 17:46:08 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	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 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.

> > +EXPORT_SYMBOL_GPL(slim_register_board_info);

> We are trying to gradually convert platforms that have hardcoded device
> lists and cannot probe devices by looking at the hardware over to using
> device tree files that list all the devices.

> I think that this would work well for slimbus and should be done
> right from the start. This means however that you should not
> register a "board_info" but instead change the slim_register_controller
> function so that it adds all devices listed as children of the
> controller in the device tree.

It seems a bit extreme to prevent anyone implementing a subsystem for
their platform until they've converted it into device tree.  Though with
slimbus it should be at least somewhat probeable IIRC?
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