Hello,
I've tried once more to fix the IPMMU problem I've reported 6 months ago,
without much more luck than last time. Here's a bit more information in the
hope it could ring a bell, somewhere.
A quick summary first. I want to enable IOMMU support for the R-Car Gen2
system DMA controller (DMAC).
When adding a new device the driver loops over all registered IOMMUs and
calls the ipmmu_find_utlbs() function to parse the DT iommus attribute.
The function returns an error when the IOMMU referenced in DT doesn't
match the current IOMMU. The caller incorrectly breaks from the loop
immediately whe
