RE: tty/serial: Need clarification on Support for 4+M Baudrate

[Rajanikanth H V]

Alan,

Thanks for your response, suggested modification helped to get 4.8M baud
but not 4.05M as this is being approximated to 4.0M baud which happens in
tty_termios_encode_baud_rate(...).

I have precise and weird requirement to get 4.05M baud as uart
baud clock divisor value changes between 4.0M and 4.05M Baud.

Any suggestion?

Thanks,
Rajanikanth

-----Original Message-----
From: Alan Cox [mailto:alan@xxxxxxxxxxxxxxxxxxx] 
Sent: Wednesday, January 11, 2012 6:00 PM
To: Rajanikanth H V
Cc: linux-serial@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; gregkh@xxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Subject: Re: tty/serial: Need clarification on Support for 4+M Baudrate

On Wed, 11 Jan 2012 17:49:01 +0530
> I have a requirement to interface UART with an external microcontroller 
> using baud rate above 4Mbps, hence following is my approach to apply
> the changes. Can any one review/provide me appropriate approach.

See TCGETS2/TCSETS2 and the BOTHER flag.

The kernel supports aetting arbitary baud rates already.

Alan
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