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Document support for the Expanded Serial Peripheral Interface (xSPI) controller found on the Renesas RZ/V2H(P) (R9A09G057) and RZ/V2N (R9A09G056) SoCs. The xSPI hardware block on these SoCs is functionally identical to the one on the RZ/G3E (R9A09G047) SoC. Therefore, the existing driver can be reused without modification by using `renesas,r9a09g047-xspi` as a fallback compatible. Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Rob Herring (Arm) <robh@kernel.org> Link: https://lore.kernel.org/r/20250624171605.469724-1-prabhakar.mahadev-lad.rj@bp.renesas.com Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.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.