Re: [PATCH 05/15] iommu: Add QDA compute context bank bus to iommu_buses

[Dmitry Baryshkov]

On Tue, May 19, 2026 at 11:45:55AM +0530, Ekansh Gupta via B4 Relay wrote:
> From: Ekansh Gupta <ekansh.gupta@xxxxxxxxxxxxxxxx>
> 
> Register the QDA compute context bank bus (qda-compute-cb) with the
> IOMMU subsystem by adding it to the iommu_buses[] array.
> 
> The QDA driver creates synthetic devices on this bus to represent
> IOMMU context banks (CBs). Each CB device needs its own IOMMU domain
> so that the DSP memory manager can enforce per-session address space
> isolation. Without this registration, the IOMMU subsystem does not
> probe CB devices for IOMMU groups and of_dma_configure() in the bus
> dma_configure callback has no IOMMU domain to attach to.
> 
> Assisted-by: Claude:claude-4-6-sonnet
> Signed-off-by: Ekansh Gupta <ekansh.gupta@xxxxxxxxxxxxxxxx>
> ---
>  drivers/iommu/iommu.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>


-- 
With best wishes
Dmitry