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All zero read and write masks in the regmap config are used to signal no special mask is needed and the bus defaults are used. In some devices all zero read/write masks are the special mask and bus defaults should not be used. To signal this a new variable is added. For example SPI often sets bit 7 in address to signal to the device a read is requested. On TI AFE44xx parts with SPI interfaces no bit needs to be set as registers are either read or write only and the operation can be determined from the address only. For this case both masks must be zero to not effect the address. Signed-off-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org> |
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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.