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. > > Cc: Yong Wu <yong.wu@xxxxxxxxxxxx> > Signed-off-by: Miles Chen <miles.chen@xxxxxxxxxxxx> > --- > 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
