linux-kernel - [PATCH v4 5/5] iommu/arm-smmu: describe the limitation of #iommu-cells

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Date:	Thu, 15 Oct 2015 16:30:47 +0800
From:	Zhen Lei <thunder.leizhen@...wei.com>
To:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Joerg Roedel <joro@...tes.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	iommu <iommu@...ts.linux-foundation.org>,
	Robin Murphy <robin.murphy@....com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	"Tianhong Ding" <dingtianhong@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH v4 5/5] iommu/arm-smmu: describe the limitation of #iommu-cells

Only support #iommu-cells = <1>.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
index 947863a..4845d44 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
@@ -5,6 +5,12 @@ revisions, replacing the MMIO register interface with in-memory command
 and event queues and adding support for the ATS and PRI components of
 the PCIe specification.

+Please read ./iommu.txt first, here list something special as below:
+
+** SMMUv3 limited properties:
+- #iommu-cells      : fixed to <1>. The pci root device is a special case,
+                      its IDs can be omitted in dts, seems #iommu-cells = <0>.
+
 ** SMMUv3 required properties:

 - compatible        : Should include:
--
2.5.0


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