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It is possible to read all lines of a generic MMIO GPIO chip with a single register read so support this if we are in native endianness. Add an especially quirky callback to read multiple lines for the variants that require you to read values from the output registers if and only if the line is set as output. We managed to do that with a maximum of two register reads, and just one read if the requested lines are all input or all output. Cc: Anton Vorontsov <anton@enomsg.org> Cc: Lukas Wunner <lukas@wunner.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.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.