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Agilex5 includes an ARM SMMU v3 (System Memory Management Unit) to provide address translation and memory protection for DMA-capable devices such as PCIe, USB, and other peripherals. This commit adds the SMMU node to the Agilex5 device tree with compatible string "arm,smmu-v3", along with its register space and interrupts. The SMMU is required to: - Enable DMA address translation for devices that cannot directly access the full physical memory space. - Provide isolation and memory protection by restricting device access to specific regions of memory, improving system security. - Support virtualization use cases by enabling safe and isolated device passthrough to guest VMs. - Align with ARM platform architecture requirements for IOMMU support. By describing the SMMU in the device tree, the Linux IOMMU framework can probe and initialize it during boot. Devices in the system can then bind to the SMMU via the `iommus` property, enabling memory translation and protection features as expected. The following devices are updated to reference the SMMU: - NAND controller - DMA controller - SPI controller This change is a necessary step toward full enablement high-speed peripherals on Agilex5. Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@altera.com> Signed-off-by: Khairul Anuar Romli <khairul.anuar.romli@altera.com> Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
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.