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

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Date:	Sat, 17 May 2014 22:48:06 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Cho KyongHo <pullip.cho@...sung.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Grundler <grundler@...omium.org>,
	Dave Martin <Dave.Martin@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Will Deacon <will.deacon@....com>,
	Joerg Roedel <joro@...tes.org>,
	Stephen Warren <swarren@...dotorg.org>,
	devicetree@...r.kernel.org, iommu@...ts.linux-foundation.org,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] devicetree: Add generic IOMMU device tree bindings

On Sat, May 17, 2014 at 05:04:55PM +0900, Cho KyongHo wrote:
> On Fri, 16 May 2014 14:23:18 +0200, Thierry Reding wrote:
[...]
> > +Examples:
> > +=========
> > +
> > +Single-master IOMMU:
> > +--------------------
> > +
> > +	iommu {
> > +		#iommu-cells = <0>;
> > +	};
> > +
> > +	master {
> > +		iommu = <&/iommu>;
> > +	};
> > +
> 
> Great work, Thierry.
> 
> One simple comment.
> 
> This should be also applicable to multi-master IOMMUs that the masters
> of an IOMMU is not configurable with ID or something.
> I think the title needs to be changed to cover such IOMMUs which always
> translate master's transactions and unable to change the configuration
> of the relationship between the masters and IOMMUs by S/W.

Agreed, how about we add a separate example for that case:

Multiple-master IOMMU with fixed associations:
----------------------------------------------

	/* multiple-master IOMMU */
	iommu {
		/*
		 * Masters are statically associated with this IOMMU and
		 * address translation is always enabled.
		 */
		#iommu-cells = <0>;
	};

	/* static association with IOMMU */
	master@1 {
		reg = <1>;
		iommus = <&/iommu>;
	};

	/* static association with IOMMU */
	master@2 {
		reg = <2>;
		iommus = <&/iommu>;
	};

?

Thierry

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