linux-kernel - Re: serial: custom baud rate

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Message-ID: <20180504135904.GJ29205@thunk.org>
Date:   Fri, 4 May 2018 09:59:04 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Muni Sekhar <munisekharrms@...il.com>
Cc:     linux-serial <linux-serial@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: serial: custom baud rate

On Fri, May 04, 2018 at 02:34:51PM +0530, Muni Sekhar wrote:
> > See the setserial man page:t
> >
> >         https://linux.die.net/man/8/setserial
> >
> > Not all serial devices support the spd_cust and divisor, however.  In
> > general, only devices where the kernel directly programs the
> > 8250/16450/16550 UART directly will support this feature.
> >
> So custom baud's can be set via TIOCSSERIAL IOCtl in kernel mode?

ioctl's are in general designed for use in userspace.  So are the
termios interface.

					- Ted