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SubjectRe: [PATCH v1] 8250: add support for DTR/DSR hardware flow control
> Please read the '[PATCH/RFC] 8250: Auto RS485 direction control' thread for background information. In a nutshell we need more than just CTS/RTS and DTR/DSR, and we don't have enough c_cflags bits. We will probably have to create a new ioctl.

Maybe - fortunately the kernel and user termios structure are now
independent so we can extend ktermios easily enough.

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