8d47923772
Add basic support for RS485: Provide a callback to configure RS485 settings. Handle the RS485 specific part in the functions pl011_rs485_tx_start() and pl011_rs485_tx_stop() which extend the generic start/stop callbacks. Beside via IOCTL from userspace RS485 can be enabled by means of the device tree property "rs485-enabled-at-boot-time". Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Link: https://lore.kernel.org/r/20210630225644.3744-1-LinoSanfilippo@gmx.de 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.