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The 16550a serial port based on the ACPI table requires obtaining the reg-shift attribute. In the ACPI scenario, If the reg-shift property is not configured like in DTS, the 16550a serial driver cannot read or write controller registers properly during initialization. Signed-off-by: Guanbing Huang <albanhuang@tencent.com> Suggested-by: Andy Shevchenko <andriy.shevchenko@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Bing Fan <tombinfan@tencent.com> Tested-by: Linheng Du <dylanlhdu@tencent.com> Link: https://lore.kernel.org/r/4726ecea8f7bfbfe42501b4f6ad9fe5b38994574.1713234515.git.albanhuang@tencent.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.