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The MPC8xxx driver is always instantiating its generic GPIO functions with the flag BGPIOF_BIG_ENDIAN. This means "big-endian bit order" and means the bits representing the GPIO lines in the registers are reversed around 31 bits so line 0 is at bit 31 and so forth down to line 31 in bit 0. Instead of looping into the generic MMIO gpio to do the simple calculation of a bitmask, through a vtable call with two parameters likely using stack frames etc (unless the compiler optimize it) and obscuring the view for the programmer, let's just open-code what the call does. This likely executes faster, saves space and makes the code easier to read. Cc: Liu Gang <Gang.Liu@nxp.com> Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.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.