From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thierry Reding <thierry.reding@gmail.com>
Subject: Re: [PATCH] devicetree: Add generic IOMMU device tree bindings
Date: Sat, 17 May 2014 22:48:06 +0200
Message-ID: <20140517204805.GA1046@mithrandir>
References: <1400242998-437-1-git-send-email-thierry.reding@gmail.com>
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To: Cho KyongHo <pullip.cho@samsung.com>
Cc: Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>, Mark Rutland <mark.rutland@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Kumar Gala <galak@codeaurora.org>, Arnd Bergmann <arnd@arndb.de>, Grant Grundler <grundler@chromium.org>, Dave Martin <Dave.Martin@arm.com>, Marc Zyngier <marc.zyngier@arm.com>, Will Deacon <will.deacon@arm.com>, Joerg Roedel <joro@8bytes.org>, Stephen Warren <swarren@wwwdotorg.org>, devicetree@vger.kernel.org, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org
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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:
> > +=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > +
> > +Single-master IOMMU:
> > +--------------------
> > +
> > +	iommu {
> > +		#iommu-cells =3D <0>;
> > +	};
> > +
> > +	master {
> > +		iommu =3D <&/iommu>;
> > +	};
> > +
>=20
> Great work, Thierry.
>=20
> One simple comment.
>=20
> 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 =3D <0>;
	};

	/* static association with IOMMU */
	master@1 {
		reg =3D <1>;
		iommus =3D <&/iommu>;
	};

	/* static association with IOMMU */
	master@2 {
		reg =3D <2>;
		iommus =3D <&/iommu>;
	};

?

Thierry

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