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Avoid hogging chip select GPIOs just because they are listed for the master. They might be mulitplexed and, if no slave device is attached, used for different purposes. Moreover, this strategy avoids having to allocate a cs_gpiods structure. Tested on the IOT2000 where the second SPI bus is connected to an Arduino-compatible connector and multiplexed between SPI, GPIO and PWM usage. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.