Re: [PATCH v4 1/9] dt-bindings: host1x: Add iommu-map property

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On 3/1/22 20:12, Robin Murphy wrote:
On 2022-03-01 16:14, cyndis@xxxxxxxx wrote:
From: Mikko Perttunen <mperttunen@xxxxxxxxxx>

Add schema information for specifying context stream IDs. This uses
the standard iommu-map property.

Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
v3:
* New patch
v4:
* Remove memory-contexts subnode.
---
  .../bindings/display/tegra/nvidia,tegra20-host1x.yaml        | 5 +++++
  1 file changed, 5 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..0adeb03b9e3a 100644
--- a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.yaml +++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-host1x.yaml
@@ -144,6 +144,11 @@ allOf:
          reset-names:
            maxItems: 1
+        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

Nit: maybe "context IDs 0..n" for maximum possible clarity?

I left it at "IDs" since there is no "context ID" or similar concept in the hardware, so I thought to leave it just as a kind of an 'abstract ID as used in iommu-map property'.


Either way, though, I'm happy that if the simplest and most straightforward approach works, then it's the best choice.

I am happy as well, this is certainly much cleaner than the mess in the downstream driver :)


Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx>

Cheers,
Robin.

Thanks!
Mikko


+            usable stream IDs.
+
        required:
          - reg-names




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