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The MediaTek V1 IOMMU is arm32 whose default domain type is IOMMU_DOMAIN_UNMANAGED. Add this to satisfy the bus_iommu_probe to enter "probe_finalize". The iommu framework will create a iommu domain for each a device. But all the devices share a iommu domain here, thus we skip all the other domains in the "attach_device" except the domain we create internally with arm_iommu_create_mapping. Also a minor change: in the attach_device, "data" always is not null. Remove "if (!data) return". Signed-off-by: Yong Wu <yong.wu@mediatek.com> Link: https://lore.kernel.org/r/1589530123-30240-1-git-send-email-yong.wu@mediatek.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.