linux-kernel - Re: multiple drivers, single device

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Message-ID: <adak5lavzpf.fsf@cisco.com>
Date:	Tue, 12 Feb 2008 09:42:20 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Greg KH <greg@...ah.com>
Cc:	Jeff Garzik <jeff@...zik.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>, linux-next@...r.kernel.org,
	linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus <torvalds@...ux-foundation.org>
Subject: Re: multiple drivers, single device

 > The work I'm doing here is for stupid PCI firmware engineers, who have
 > created devices that are different things, all bound up under the same
 > PCI device.  I'm thinking of watchdog timers and random number
 > generator and i2c controller on the same PCI device, or even the more
 > basic, frame buffer and DRM access to the same PCI video device.
 > 
 > The OLPC is a good example of hardware that needs this kind of
 > functionality.

Sounds interesting.  I've been meaning to work on this too for quite a
while, but I'm glad to see you beat me to it.

An example of an in-tree use case for this would be the mlx4 drivers--
you can look at drivers/net/mlx4/intf.c to see the simple stupid
solution I came up with to allow an IB and a NIC (not yet upstream)
driver to share the same PCI device.  A good test for your stuff would
be if it simplifies the code from the ad hoc solution I came up with.

 - R.
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