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The latest eMMC JEDEC specification version 5.1 added a new transfer mode, HS400 with enhanced strobe (HS400ES). This mode will be selected if both the host controller and eMMC device support it. The latest Arasan 5.1 controller in the 7216a0 supports this mode. The "Host Controller Specification" has not been updated so the controller register bit used to enable this mode is not specified and varies the with controller vendor. The Linux SDHCI driver supplies a callback for enabling HS400ES mode and that callback will be used to supply a routine that will set the proper bit in the Arasan Vendor register. Signed-off-by: Al Cooper <alcooperx@gmail.com> Link: https://lore.kernel.org/r/20200113210706.11972-3-alcooperx@gmail.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 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.