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For legacy platforms without dummy pad: When clock <= 100MHz: Set ESDHC_MIX_CTRL_FBCLK_SEL to 0 (external clock pad loopback) for better bus clock proximity. When clock > 100MHz: Set ESDHC_MIX_CTRL_FBCLK_SEL to 1 (internal clock loopback) to avoid signal reflection noise at high frequency. For i.MX94/95 with dummy pad support: Keep ESDHC_MIX_CTRL_FBCLK_SEL at 0 for all speed mode. Hardware automatically substitutes clock pad loopback with dummy pad loopback when available, eliminating signal reflections while preserving better bus clock proximity. Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Link: https://lore.kernel.org/r/20250521025502.112030-2-ziniu.wang_1@nxp.com Signed-off-by: Ulf Hansson <ulf.hansson@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.