[PATCH v4 1/7] iommu: Add IOMMU uclass

[Simon Glass]

On Sat, 23 Oct 2021 at 08:58, Mark Kettenis <kettenis at openbsd.org> wrote:
>
> This uclass is intended to manage IOMMUs on systems where the
> IOMMUs are not in bypass mode by default.  In that case U-Boot
> cannot ignore the IOMMUs if it wants to use devices that need
> to do DMA and sit behind such an IOMMU.
>
> This initial IOMMU uclass implementation does not implement and
> device ops and is intended for IOMMUs that have a bypass mode
> that does not require address translation.  Support for IOMMUs
> that do require address translation is planned and device ops
> will be defined when support for such IOMMUs will be added.
>
> Signed-off-by: Mark Kettenis <kettenis at openbsd.org>
> ---
>
> ChangeLog:
>
> v4: - Copy generic IOMMU DT bindings from Linux
>     - Explain IOMMU KConfig option
>     - Rename dev_iommu_probe()
>
>
>  doc/device-tree-bindings/iommu/iommu.txt | 206 +++++++++++++++++++++++
>  drivers/Kconfig                          |   2 +
>  drivers/Makefile                         |   1 +
>  drivers/core/device.c                    |   8 +
>  drivers/iommu/Kconfig                    |  17 ++
>  drivers/iommu/Makefile                   |   3 +
>  drivers/iommu/iommu-uclass.c             |  45 +++++
>  include/dm/uclass-id.h                   |   1 +
>  include/iommu.h                          |  16 ++
>  9 files changed, 299 insertions(+)
>  create mode 100644 doc/device-tree-bindings/iommu/iommu.txt
>  create mode 100644 drivers/iommu/Kconfig
>  create mode 100644 drivers/iommu/Makefile
>  create mode 100644 drivers/iommu/iommu-uclass.c
>  create mode 100644 include/iommu.h

Reviewed-by: Simon Glass <sjg at chromium.org>