linux-kernel - Re: RFC: (re-)binding the VFIO platform driver to a platform device

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Date:	Thu, 3 Oct 2013 11:54:34 -0700
From:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:	Scott Wood <scottwood@...escale.com>
Cc:	Christoffer Dall <christoffer.dall@...aro.org>,
	Yoder Stuart-B08248 <B08248@...escale.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Kim Phillips <kim.phillips@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"a.motakis@...tualopensystems.com" <a.motakis@...tualopensystems.com>,
	"agraf@...e.de" <agraf@...e.de>,
	Wood Scott-B07421 <B07421@...escale.com>,
	Sethi Varun-B16395 <B16395@...escale.com>,
	Bhushan Bharat-R65777 <R65777@...escale.com>,
	"peter.maydell@...aro.org" <peter.maydell@...aro.org>,
	"santosh.shukla@...aro.org" <santosh.shukla@...aro.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: RFC: (re-)binding the VFIO platform driver to a platform device

On Thu, Oct 03, 2013 at 01:33:27PM -0500, Scott Wood wrote:
> What it looks like we do still want from the driver core is the ability
> for a driver to say that it should not be bound to a device except via
> explicit sysfs bind,

You can do that today by not providing any device ids in your driver
structure, relying on the dynamic ids the driver core creates.

> and the ability for a user to say that a device should not be bound to
> a driver except via explicit sysfs bind.

That's not going to happen, as how can the kernel know a specific device
is going to want this, before it asks the drivers about it?

Or, just don't ever create a driver that matches that device, then rely
on userspace to do the binding explicitly.

Either way, no driver core changes are needed from what I can tell.

greg k-h
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