From: Robin Murphy <robin.murphy@arm.com>
To: hannah@marvell.com, catalin.marinas@arm.com, will.deacon@arm.com,
corbet@lwn.net, joro@8bytes.org, robh+dt@kernel.org,
gregory.clement@bootlin.com, mark.rutland@arm.com,
jason@lakedaemon.net, andrew@lunn.ch,
sebastian.hesselbarth@gmail.com
Cc: devicetree@vger.kernel.org, linux-doc@vger.kernel.org,
omrii@marvell.com, linux-kernel@vger.kernel.org,
nadavh@marvell.com, iommu@lists.linux-foundation.org,
thomas.petazzoni@bootlin.com,
linux-arm-kernel@lists.infradead.org, nd@arm.com
Subject: Re: [PATCH 3/4] dt-bindings: iommu/arm, smmu: add compatible string for Marvell
Date: Mon, 15 Oct 2018 14:11:52 +0100 [thread overview]
Message-ID: <3ce1d67a-4e3c-e8d8-f7fc-79649f1def68@arm.com> (raw)
In-Reply-To: <1539604846-21151-4-git-send-email-hannah@marvell.com>
On 15/10/18 13:00, hannah@marvell.com wrote:
> From: Hanna Hawa <hannah@marvell.com>
>
> Add specific compatible string for Marvell usage due errata of
> accessing 64bit registers of ARM SMMU, in AP806.
>
> AP806 SOC use the generic ARM-MMU500, and there's no specific
> implementation of Marvell, this compatible is used for errata only.
Given that, I think something more specific like:
"marvell,ap806-smmu", "arm,mmu-500";
would be most appropriate. Otherwise, if some future Marvell SoC were to
ever come out with a *different* MMU-500 integration problem, you'd
already have painted yourself into a corner.
Alternatively (or additionally), we could perhaps consider a separate
property like "marvell,32bit-config-access", to mirror the existing
handling of the secure integration bug.
Robin.
> Signed-off-by: Hanna Hawa <hannah@marvell.com>
> ---
> Documentation/devicetree/bindings/iommu/arm,smmu.txt | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
> index 8a6ffce..92d7263 100644
> --- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt
> +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
> @@ -16,6 +16,7 @@ conditions.
> "arm,mmu-400"
> "arm,mmu-401"
> "arm,mmu-500"
> + "marvell,mmu-500"
> "cavium,smmu-v2"
>
> depending on the particular implementation and/or the
>
next prev parent reply other threads:[~2018-10-15 13:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-15 12:00 [PATCH 0/4] Add system mmu support for Armada-806 hannah
2018-10-15 12:00 ` [PATCH 1/4] iommu/arm-smmu: introduce wrapper for writeq/readq hannah
2018-10-15 12:00 ` [PATCH 2/4] iommu/arm-smmu: Workaround for Marvell Armada-AP806 SoC erratum #582743 hannah
2018-10-15 13:00 ` Robin Murphy
2018-10-16 8:25 ` Hanna Hawa
2018-10-18 16:08 ` Robin Murphy
2018-10-15 12:00 ` [PATCH 3/4] dt-bindings: iommu/arm,smmu: add compatible string for Marvell hannah
2018-10-15 13:11 ` Robin Murphy [this message]
2018-10-18 20:48 ` [PATCH 3/4] dt-bindings: iommu/arm, smmu: " Rob Herring
2018-10-15 12:00 ` [PATCH 4/4] arm64: dts: marvell: add smmu node for Armada-AP806 hannah
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