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From: Miles Chen <miles.chen@mediatek.com>
To: Joerg Roedel <joro@8bytes.org>, Rob Herring <robh+dt@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>
Cc: devicetree@vger.kernel.org, wsd_upstream@mediatek.com,
	linux-kernel@vger.kernel.org, Chao Hao <chao.hao@mediatek.com>,
	iommu@lists.linux-foundation.org,
	linux-mediatek@lists.infradead.org,
	Miles Chen <miles.chen@mediatek.com>,
	Yingjoe Chen <yingjoe.chen@mediatek.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/4] dt-bindings: mediatek: add mediatek,infracfg phandle
Date: Thu, 2 Jul 2020 17:37:17 +0800	[thread overview]
Message-ID: <20200702093721.6063-1-miles.chen@mediatek.com> (raw)

Add a description for mediatek,infracfg. We can check if 4GB mode
is enable by reading it instead of checking the unexported
symbol "max_pfn".

This is a step towards building mtk_iommu as a kernel module.

Cc: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
---
 Documentation/devicetree/bindings/iommu/mediatek,iommu.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt b/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
index ce59a505f5a4..a7881deabcca 100644
--- a/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
+++ b/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
@@ -74,6 +74,8 @@ Required properties:
 - mediatek,larbs : List of phandle to the local arbiters in the current Socs.
 	Refer to bindings/memory-controllers/mediatek,smi-larb.txt. It must sort
 	according to the local arbiter index, like larb0, larb1, larb2...
+- mediatek,infracfg: a phandle to infracfg. It is used to confirm if 4GB mode is set.
+	It is an optional property, add it when the SoC have 4g mode.
 - iommu-cells : must be 1. This is the mtk_m4u_id according to the HW.
 	Specifies the mtk_m4u_id as defined in
 	dt-binding/memory/mt2701-larb-port.h for mt2701, mt7623
-- 
2.18.0
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             reply	other threads:[~2020-07-02  9:37 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-02  9:37 Miles Chen [this message]
2020-07-02  9:37 ` [PATCH 2/4] arm64: dts: mt2712: add mediatek,infracfg to iommu Miles Chen
2020-07-02  9:37 ` [PATCH 3/4] arm64: dts: mt8173: " Miles Chen
2020-07-02  9:37 ` [PATCH 4/4] iommu/mediatek: check 4GB mode by reading infracfg Miles Chen
2020-07-15 21:05   ` Matthias Brugger
2020-07-17  8:26     ` Miles Chen
2020-07-15 20:51 ` [PATCH 1/4] dt-bindings: mediatek: add mediatek,infracfg phandle Rob Herring
2020-07-17  8:18   ` Miles Chen

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