linux-kernel - Re: [RFC 2/5] ARM: OMAP: omap_device: add a method to set iommu private archdata

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Date:	Mon, 26 Sep 2011 15:53:22 -0700
From:	Kevin Hilman <khilman@...com>
To:	Ohad Ben-Cohen <ohad@...ery.com>
Cc:	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Joerg Roedel <Joerg.Roedel@....com>,
	<iommu@...ts.linux-foundation.org>, Arnd Bergmann <arnd@...db.de>,
	<linux-kernel@...r.kernel.org>, Cousson Benoit <b-cousson@...com>,
	Tony Lindgren <tony@...mide.com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [RFC 2/5] ARM: OMAP: omap_device: add a method to set iommu private archdata

Hi Ohad,

Ohad Ben-Cohen <ohad@...ery.com> writes:

> Make it possible to set an iommu private archdata before a newly-created
> omap device is registered.
>
> Binding iommu client devices with their respective iommu data this way
> is needed so the generic IOMMU API can later be used without employing
> any omap-specific IOMMU plumbing.
>
> This patch just crudely adds an omap_device_build_ss_ext() method which
> accepts an iommu private data, but we may actually want to do something
> more generic here: e.g., split the omap_device_build API to alloc+add
> methods, so users can just manipulate the device as needed before it is
> registered (very much like we can do with plain devices).

Yes indeed.  

Benoit did just this in preparation for DT. 

       http://marc.info/?l=linux-omap&m=131672480111927&w=2

Will that meet your needs?

Kevin
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