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i2c_mux_add_adapter takes a force_nr parameter that allows an explicit bus number to be associated with a channel. However, only i2c-mux-reg and i2c-mux-gpio make use of it. To help with situations where it is desirable to have a fixed, known base address for the channels of a mux, create a "base-nr" property. When force_nr is 0 and base-nr is set and non-zero, form a force_nr value from the sum of base-nr and the channel ID. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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.
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