Re: [PATCH v5 3/4] dt-bindings: sound: qcom,q6apm-dai: add memory-region and relax iommus

[Ajay Kumar Nandam <ajay.nandam@oss.qualcomm.com>]

On 9/22/2026 6:16 PM, Rob Herring (Arm) wrote:
> 
> On Tue, 22 Sep 2026 00:38:11 +0530, Ajay Kumar Nandam wrote:
>> On modem-DSP (mDSP) platforms the DSP runs in a stage-2 protected
>> context and cannot use the SMMU. PCM buffers must live in reserved-memory
>> carveouts that are SCM-assigned to the appropriate VMIDs.
>>
>> Add an optional memory-region property (1-2 entries) for the
>> control-path and data-path carveouts, and remove iommus from the
>> required list since mDSP platforms have neither IOMMU nor VMID DT
>> properties.
>>
>> Signed-off-by: Ajay Kumar Nandam <ajay.nandam@oss.qualcomm.com>
>> ---
>>   Documentation/devicetree/bindings/sound/qcom,q6apm-dai.yaml | 12 +++++++++++-
>>   1 file changed, 11 insertions(+), 1 deletion(-)
>>
> 
> My bot found errors running 'make dt_binding_check' on your patch:
> 
> yamllint warnings/errors:
> 
> dtschema/dtc warnings/errors:
> /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/sound/qcom,q6apm-dai.yaml: properties:memory-region: {'minItems': 1, 'maxItems': 2, 'items': [{'description': 'Control-path buffer (audio_heap_mem) for platforms where the DSP runs in a stage-2 protected context (e.g. modem-DSP).'}, {'description': 'Data-path buffer pool from which per-stream DMA buffers are allocated.'}]} should not be valid under {'required': ['maxItems']}
> 	hint: "maxItems" is not needed with an "items" list
> 	from schema $id: http://devicetree.org/meta-schemas/items.yaml
> 
> doc reference errors (make refcheckdocs):
> 
> See https://patchwork.kernel.org/project/devicetree/patch/20260922-vmid-v4-v5-3-e79cfd7af5b3@oss.qualcomm.com
> 
> The base for the series is generally the latest rc1. A different dependency
> should be noted in *this* patch.
> 
> If you already ran 'make dt_binding_check' and didn't see the above
> error(s), then make sure 'yamllint' is installed and dt-schema is up to
> date:
> 
> pip3 install dtschema --upgrade
> 
> Please check and re-submit after running the above command yourself. Note
> that DT_SCHEMA_FILES can be set to your schema file to speed up checking
> your schema. However, it must be unset to test all examples with your schema.
> 

Thanks Rob, fixed in v6 by dropping the redundant maxItems from 
memory-region. The focused binding validation passes locally, and I will 
  include the base-commit trailer in v6.

Thanks
Ajay Kumar Nandam