On Fri, Nov 12, 2021 at 02:12:28PM +0100, Thierry Reding wrote: > From: Thierry Reding <treding@xxxxxxxxxx> > > On NVIDIA SoC's the ARM SMMU needs to interact with the memory > controller in order to map memory clients to the corresponding stream > IDs. Document how the nvidia,memory-controller property can be used to > achieve this. > > Signed-off-by: Thierry Reding <treding@xxxxxxxxxx> > --- > Documentation/devicetree/bindings/iommu/arm,smmu.yaml | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml > index f66a3effba73..cf32a7955475 100644 > --- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml > +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml > @@ -155,6 +155,12 @@ properties: > power-domains: > maxItems: 1 > > + nvidia,memory-controller: > + description: A phandle to the memory controller on NVIDIA Tegra186 > + and later SoCs. The memory controller needs to be programmed with > + a mapping of memory client IDs to ARM SMMU stream IDs. > + $ref: /schemas/types.yaml#/definitions/phandle > + > required: > - compatible > - reg > @@ -177,6 +183,9 @@ allOf: > reg: > minItems: 1 > maxItems: 2 > + > + required: > + - nvidia,memory-controller That's not a compatible change. Document why it is necessary if that's intended. > else: > properties: > reg: > -- > 2.33.1 > >
