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When userspace passes the SER_RS485_RTS_ON_SEND flag it means that the CTS_B pin should go to logic level high before the transmission begins. CTS_B goes to logic level high when both CTSC and CTS bits are cleared. When userspace passes the SER_RS485_RTS_AFTER_SEND flag it means that the CTS_B pin should go to logic level low after the transmission finishes. CTS_B goes to logic level low when CTSC bit is cleared and CTS bit is set. So fix the CTS_B polarity logic. Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.