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The forced conversion of native CS lines into software CS lines is done whether or not the controller has been given any CS lines to use. This breaks the use of the spi0-0cs overlay to prevent SPI from claiming any CS lines, particularly with spidev which doesn't pass in the SPI_NO_CS flag at creation. Use the presence of an empty cs-gpios property as an indication that no CS lines should be used, bypassing the native CS conversion code. See: https://github.com/raspberrypi/linux/issues/5835 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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