On Mon, Aug 17, 2026 at 10:17:40AM +0530, Ekansh Gupta wrote: > 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.
I didn't notice a clear explanation of the proposed DT schema for this But it looks awfully similar to the other driver that was creating a kernel synthetic bus for actual real HW, that wasn't well liked. What is this for? Why can't you have a normal DT binding for the iommu with normal devices? Jason
