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6a42bc97ccMacronix swaps bytes on a 16-bit boundary when configured in Octal DTR. The byte order of 16-bit words is swapped when read or written in 8D-8D-8D mode compared to STR modes. Allow operations to specify the byte order in DTR mode, so that controllers can swap the bytes back at run-time to address the flash's endianness requirements, if they are capable. If the controller is not capable of swapping the bytes, the protocol is downgrade via spi_nor_spimem_adjust_hwcaps(). When available, the swapping of the bytes is always done regardless if it's a data or register access, so that it comply with the JESD216 requirements: "Byte order of 16-bit words is swapped when read in 8D-8D-8D mode compared to 1-1-1". Merge Tudor's patch and add modifications for suiting newer version of Linux kernel. Suggested-by: Michael Walle <mwalle@kernel.org> Signed-off-by: JaimeLiao <jaimeliao@mxic.com.tw> Signed-off-by: AlvinZhou <alvinzhou@mxic.com.tw> Link: https://lore.kernel.org/r/20240926141956.2386374-4-alvinzhou.tw@gmail.com Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.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.