From: David Brownell <david-b@pacbell.net>
To: ext-eero.nurkkala@nokia.com
Cc: linux-omap@vger.kernel.org
Subject: Re: [PATCH] i2c: i2c-omap: Fix standard and fast mode prescalers
Date: Fri, 14 Nov 2008 11:45:30 -0800 [thread overview]
Message-ID: <200811141145.30171.david-b@pacbell.net> (raw)
In-Reply-To: <12266521173159-git-send-email-ext-eero.nurkkala@nokia.com>
On Friday 14 November 2008, ext-eero.nurkkala@nokia.com wrote:
> The prescalers for 100 kHz and 400 kHz mode
> are wrong. The internal clock is the fclock
> divided by the prescaler. The PSC is an 8 bit
> field in omap3430. Moreover, the scll and
> sclh values should be adjusted properly.
> Having the correct prescaler is important in
> the process of getting a finite i2c clock. In
> addition, the prescaler is used in the process
> of activating the correct noise filter and thus,
> lets more error resilient i2c communications.
Should this fix the bug causing the need for that
recent ZOOM patch slowing down twl4030 communication
to 400 MHz?
And should it let at least some boards talk to their
TWL chips at 3.4 MBit/sec (top speed for standard
highspeed I2C) instead of 2.6 Mbit/sec (pokey slow)?
I've always wondered why all the boards configured
those links to be seemingly slower than allowed ...
- Dave
next prev parent reply other threads:[~2008-11-14 19:45 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-14 8:41 [PATCH] i2c: i2c-omap: Fix standard and fast mode prescalers ext-eero.nurkkala
2008-11-14 19:45 ` David Brownell [this message]
2008-11-14 20:02 ` Felipe Balbi
2008-11-14 20:08 ` David Brownell
2008-11-14 21:46 ` Felipe Balbi
2008-11-17 2:46 ` shekhar, chandra
2008-11-18 5:36 ` David Brownell
2008-11-14 20:38 ` Steve Sakoman
2008-11-19 12:07 ` Eero Nurkkala
2008-11-21 22:08 ` Tony Lindgren
-- strict thread matches above, loose matches on Subject: below --
2009-01-13 6:06 Eero Nurkkala
2009-01-23 2:04 ` Tony Lindgren
2008-11-26 13:44 ext-eero.nurkkala
2008-11-27 8:38 ` Eero Nurkkala
2009-01-08 13:39 ` Tony Lindgren
2009-01-09 20:27 ` Kainan Cha
2009-01-12 6:29 ` Eero Nurkkala
2008-11-25 6:56 ext-eero.nurkkala
2008-11-11 6:52 ext-eero.nurkkala
2008-11-11 13:21 ` shekhar, chandra
2008-11-10 10:46 ext-eero.nurkkala
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200811141145.30171.david-b@pacbell.net \
--to=david-b@pacbell.net \
--cc=ext-eero.nurkkala@nokia.com \
--cc=linux-omap@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox