Re: [PATCH v3 1/9] dt-bindings: host1x: Add memory-contexts property

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On 2022-02-18 11:39, Mikko Perttunen via iommu wrote:
Add schema information for the memory-contexts property used to
specify context stream IDs. This uses the standard iommu-map property
inside a child node.

Couldn't you simply make "iommu-map" an allowed property on the host1x node itself? From a DT perspective I'm not sure the intermediate node really fits meaningfully, and I can't see that it serves much purpose in practice either, other than perhaps defeating fw_devlink.

Robin.

Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
v3:
* New patch
---
  .../bindings/display/tegra/nvidia,tegra20-host1x.yaml  | 10 ++++++++++
  1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.yaml b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.yaml
index 4fd513efb0f7..3ac0fde54a16 100644
--- a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.yaml
+++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.yaml
@@ -144,6 +144,16 @@ allOf:
          reset-names:
            maxItems: 1
+ memory-contexts:
+          type: object
+          properties:
+            iommu-map:
+              description: Specification of stream IDs available for memory context device
+                use. Should be a mapping of IDs 0..n to IOMMU entries corresponding to
+                usable stream IDs.
+          required:
+            - iommu-map
+
        required:
          - reg-names



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