linux-kernel - Re: [PATCH v4 12/21] serial: support for 16550A serial ports on LP-8x4x

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Message-ID: <20140416193532.0782f045@alan.etchedpixels.co.uk>
Date:	Wed, 16 Apr 2014 19:35:32 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Sergei Ianovich <ynvich@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Grant Likely <grant.likely@...aro.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>, Paul Bolle <pebolle@...cali.nl>,
	Stefan Seyfried <seife+kernel@...systems.com>,
	James Cameron <quozl@...top.org>,
	devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND...),
	linux-doc@...r.kernel.org (open list:DOCUMENTATION),
	linux-serial@...r.kernel.org (open list:SERIAL DRIVERS)
Subject: Re: [PATCH v4 12/21] serial: support for 16550A serial ports on
 LP-8x4x

> +	baud = uart_get_baud_rate(port, termios, old,
> +				  port->uartclk / 16 / 0xffff,
> +				  port->uartclk / 16);
> +	switch (baud) {
> +	case 2400:
> +		len |= 1;
> +		break;
> +	case 4800:
> +		len |= 2;
> +		break;
> +	case 19200:
> +		len |= 4;
> +		break;
> +	case 38400:
> +		len |= 5;
> +		break;
> +	case 57600:
> +		len |= 6;
> +		break;
> +	case 115200:
> +		len |= 7;
> +		break;
> +	case 9600:
> +	default:
> +		len |= 3;
> +		break;
> +	};

Some explanation of this would be useful - eg why is it set to 7 for
115200 baud and 3 for 115201 baud ?
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