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Agilex5 integrates an ARM SMMU (System Memory Management Unit) with
Translation Buffer Units (TBUs) assigned to various peripherals,
including the NAND controller.
The Cadence HP NAND controller ("cdns,hp-nfc") on Agilex5 is behind a
TBU connected to the system's SMMUv3. To support this, the controller
requires an `iommus` property in the device tree to properly configure
address translation through the IOMMU framework.
Adding the `iommus` property to the binding schema allows the OS
to associate the NAND controller with its corresponding SMMU stream ID.
This enables:
- DMA address translation between the controller and system memory
- Memory protection for NAND operations
- Proper functioning of the IOMMU framework in secure or virtualized
environments
This change documents the IOMMU integration for the NAND controller
on platforms like Agilex5 where such hardware is present.
Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@altera.com>
Signed-off-by: Khairul Anuar Romli <khairul.anuar.romli@altera.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
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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 reStructuredText 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.