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GQSPI controller uses the internal clock for loopback mode. The loopback mode is used with the high-speed Quad SPI timing mode, where the memory interface clock needs to be greater than 40 MHz. Based on the tap delay value programmed, the internal clock is delayed and used for capturing the data. Based upon the frequency of operation set the recommended tap delay values in GQSPI driver. Signed-off-by: Naga Sureshkumar Relli <nagasure@xilinx.com> Signed-off-by: Michal Simek <michal.simek@amd.com> Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@amd.com> Link: https://lore.kernel.org/r/20221011062040.12116-6-amit.kumar-mahapatra@amd.com Signed-off-by: Mark Brown <broonie@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 Restructured Text 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.