linux-kernel - [PATCH 1/4] dt-bindings: mediatek: add mediatek,infracfg phandle

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Message-ID: <20200702093721.6063-1-miles.chen@mediatek.com>
Date:   Thu, 2 Jul 2020 17:37:17 +0800
From:   Miles Chen <miles.chen@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     <iommu@...ts.linux-foundation.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>,
        Chao Hao <chao.hao@...iatek.com>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>
Subject: [PATCH 1/4] dt-bindings: mediatek: add mediatek,infracfg phandle

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@...iatek.com>
Signed-off-by: Miles Chen <miles.chen@...iatek.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