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fae284f1bc
At the moment, all 5 I2C and 6 SPI buses are probed and exposed to user-space by default - even if they are not muxed to any pins on the board. This means that user-space sees an I2C/SPI bus that cannot be actually used properly. In some cases this was used to put the corresponding pins into a low power sleep mode - but even then the pins first need to be configured by the board-specific device tree part. Avoid exposing unconfigured devices to user-space by disabling the I2C/SPI buses by default. Enable them in the board device trees when needed. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Link: https://lore.kernel.org/r/20191125170428.76069-1-stephan@gerhold.net Signed-off-by: Linus Walleij <linus.walleij@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.