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The UART's input clock rate can change at runtime but this is not handled by the driver. Add a clock_notifier callback that updates the divisors when the input clock is updated. The serial8250_update_uartclk() is used to do so. PRE_RATE_CHANGE and ABORT_RATE_CHANGE notifications are ignored, only the POST_RATE_CHANGE is used. Not using PRE_RATE_CHANGE notification can result in a few corrupted bytes during frequency transitions but, IMHO, it can be acceptable in many use cases. It has been tested on a DAVINCI/OMAP-L138 processor. Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com> Reviewed-by: Herve Codina <herve.codina@bootlin.com> Link: https://lore.kernel.org/r/20240405120552.35991-1-bastien.curutchet@bootlin.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.