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

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Message-ID: <2B1D156D95AE9B4EAD379CB9E465FE7324AF2A605A@EXDCVYMBSTM005.EQ1STM.local>
Date:	Thu, 12 Jan 2012 10:49:38 +0100
From:	Rajanikanth H V <rajanikanth.hv@...ricsson.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rajanikanth H V <rajanikanth.hv@...ricsson.com>
Subject: RE: tty/serial: Need clarification on Support for 4+M Baudrate

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@...rguk.ukuu.org.uk] 
Sent: Wednesday, January 11, 2012 6:00 PM
To: Rajanikanth H V
Cc: linux-serial@...r.kernel.org; linux-kernel@...r.kernel.org; gregkh@...e.de; linux-arm-kernel@...ts.infradead.org
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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