linux-kernel - Re: serial: custom baud rate

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Message-ID: <CAHhAz+iiv+h+RAPXACQuJRiEQmE1jxeS7+qaz-8fu30Fm9tNaw@mail.gmail.com>
Date:   Fri, 4 May 2018 14:34:51 +0530
From:   Muni Sekhar <munisekharrms@...il.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>,
        Muni Sekhar <munisekharrms@...il.com>,
        linux-serial <linux-serial@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: serial: custom baud rate

On Thu, May 3, 2018 at 11:24 PM, Theodore Y. Ts'o <tytso@....edu> wrote:
> On Thu, May 03, 2018 at 06:09:13PM +0530, Muni Sekhar wrote:
>> Hi All,
>>
>> From include/asm-generic/termbits.h , I see baudrate can be one of the
>> standard values: 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800,
>> 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 500000,
>> 576000, 921600, 1000000, 1152000, 1500000, 2000000, 2500000, 3000000,
>> 3500000, 4000000.
>>
>> If I need to set a custom baud rates(e.g. 14400, 128000, 256000), does
>> Linux serial framework has any supporting method?
>
> 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?
>                                                         - Ted



-- 
Thanks,
Sekhar