Re: [PATCH 1/4] dt-bindings: mediatek: add mediatek,infracfg phandle
From: Rob Herring <robh@kernel.org>
Date: 2020-07-15 20:51:25
Also in:
linux-arm-kernel, linux-iommu, linux-mediatek, lkml
On Thu, Jul 02, 2020 at 05:37:17PM +0800, Miles Chen wrote:
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.
You determined this before without DT, so it is an OS problem and shouldn't need a DT update. I'd assume there's only one instance of the node mediatek,infracfg points to, so just search for it if you want to get the info from DT.
quoted hunk ↗ jump to hunk
Cc: Yong Wu <yong.wu@mediatek.com> Signed-off-by: Miles Chen <redacted> --- 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