Re: [PATCH v6 3/4] ASoC: dt-bindings: qcom,q6apm-dai: add memory-region and relax iommus

[Krzysztof Kozlowski]

On Wed, Sep 23, 2026 at 10:03:40PM +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 a memory-region property (1-2 entries) for the control-path and
> data-path carveouts, and require q6apm-dais nodes to describe exactly
> one access path: iommus for SMMU-backed systems or memory-region for
> mDSP systems. Remove iommus from the common required list since mDSP
> platforms have neither IOMMU nor VMID DT properties.
> 
> Signed-off-by: Ajay Kumar Nandam <ajay.nandam@xxxxxxxxxxxxxxxx>
> ---
>  .../devicetree/bindings/sound/qcom,q6apm-dai.yaml       | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxxxxx>

Best regards,
Krzysztof