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We already allocate CONFIG_SERIAL_8250_NR_UARTS, but only allow using CONFIG_SERIAL_8250_RUNTIME_UARTS uarts unless nr_uarts module params is set. This causes issues for using distro kernels on SoCs with a large number of serial ports. Let's allow up to CONFIG_SERIAL_8250_NR_UARTS instead. To do this, we init the ports as needed if the initial uarts was too low. This way there's no need to set the value for CONFIG_SERIAL_8250_RUNTIME_UARTS to some SoC specific higher value. Typically the default value of 4 can be used as set for legacy reasons. Note that limiting the number of intial uarts still works as before unless a serial console on a higher port is specified. In this case we will increase the nr_ports up to the console port specified. Suggested-by: Andrew Davis <afd@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Link: https://lore.kernel.org/r/20230508111903.39339-1-tony@atomide.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 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.