linux-kernel - Re: [PATCH v2] devicetree: Add generic IOMMU device tree bindings

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Message-ID: <20140604213159.GB18780@mithrandir>
Date:	Wed, 4 Jun 2014 23:32:00 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Dave Martin <Dave.Martin@....com>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Grant Grundler <grundler@...omium.org>,
	Joerg Roedel <joro@...tes.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
	iommu@...ts.linux-foundation.org, Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>, linux-tegra@...r.kernel.org,
	Cho KyongHo <pullip.cho@...sung.com>,
	Hiroshi Doyu <hdoyu@...dia.com>
Subject: Re: [PATCH v2] devicetree: Add generic IOMMU device tree bindings

On Fri, May 30, 2014 at 09:01:19PM +0200, Arnd Bergmann wrote:
> On Friday 30 May 2014 12:22:32 Dave Martin wrote:
> > > +
> > > +Examples:
> > > +=========
> > > +
> > > +Single-master IOMMU:
> > > +--------------------
> > > +
> > > +	iommu {
> > > +		#address-cells = <0>;
> > > +		#size-cells = <0>;
> > > +	};
> > > +
> > > +	master {
> > > +		iommus = <&/iommu>;
> > > +	};
> > > +
> > > +Multiple-master IOMMU with fixed associations:
> > > +----------------------------------------------
> > > +
> > > +	/* multiple-master IOMMU */
> > > +	iommu {
> > > +		/*
> > > +		 * Masters are statically associated with this IOMMU and
> > > +		 * address translation is always enabled.
> > > +		 */
> > > +		#address-cells = <0>;
> > > +		#size-cells = <0>;
> > 
> > In this example, can different translations be set up for the different
> > masters?
> > 
> > With no cells available to contain any sort of ID, it looks like this
> > is not possible.
> 
> Correct, this example is for an IOMMU that does not use IDs but has a
> shared address space for all devices.

Couldn't these device all still have separate address spaces?

Thierry

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