02.10.2020 18:23, Dmitry Osipenko пишет: > 02.10.2020 09:08, Nicolin Chen пишет: >> Then when a client gets probed, of_iommu_configure() in >> iommu core will search DTB for swgroup ID and call ->of_xlate() >> to prepare an fwspec, similar to tegra_smmu_probe_device() and >> tegra_smmu_configure(). Then it'll call tegra_smmu_probe_device() >> again, and this time we shall return smmu->iommu pointer properly. > > I don't quite see where IOMMU core calls of_xlate(). > > Have tried to at least boot-test this patch? > I don't see how it ever could work because of_xlate() is only invoked from: fsl_mc_dma_configure()->of_dma_configure_id()->of_iommu_configure() Looks like the tegra_smmu_configure() is still needed. I don't know how sun50i driver could work to be honest. Seems IOMMU is broken on sun50i, but maybe I'm missing something. I added Maxime Ripard to this thread, who is the author of the sun50i-iommu driver.
