From: David Brownell <david-b@pacbell.net>
To: Jarkko Nikula <jarkko.nikula@nokia.com>
Cc: linux-omap-open-source@linux.omap.com
Subject: Re: [PATCH 2/3] ARM: OMAP: Use I2C bus registration helper
Date: Mon, 5 Nov 2007 01:56:40 -0800 [thread overview]
Message-ID: <200711050156.40287.david-b@pacbell.net> (raw)
In-Reply-To: <20071105102657.f195e5c0.jarkko.nikula@nokia.com>
On Monday 05 November 2007, Jarkko Nikula wrote:
>
> > Is there a reason you're not using 400k anywhere?
> > ISTR at one point checking specs and finding that
> > many TI dev boards were spec'd so that 400k should
> > work fine.
> >
> Reason is to not break anything :-)
>
> Honestly I don't believe that we have many boards with components not
> rated for 400 kHz.
Most components are rated like that. Unfortunately it
seems the isp1301 transceiver -- for full speed USB-OTG
support -- has a 100 KHz ceiling on the clock rate,
so bus segments with those (found on H2, H3, H4, and
surely a few others) can't use 400K. Ditto the pcf8574
I/O expanders.
- Dave
next prev parent reply other threads:[~2007-11-05 9:56 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-02 13:46 [PATCH/RFC 0/3] I2C bus registration helper jarkko.nikula
2007-11-02 13:46 ` [PATCH 1/3] ARM: OMAP: Add helper module for board specific I2C bus registration jarkko.nikula
2007-11-02 16:22 ` David Brownell
2007-11-05 8:19 ` Jarkko Nikula
2007-11-06 8:26 ` David Brownell
2007-11-06 10:53 ` Jarkko Nikula
2007-11-06 12:51 ` Tony Lindgren
2007-11-02 13:46 ` [PATCH 2/3] ARM: OMAP: Use I2C bus registration helper jarkko.nikula
2007-11-02 16:27 ` David Brownell
2007-11-05 8:26 ` Jarkko Nikula
2007-11-05 9:56 ` David Brownell [this message]
2007-11-02 13:46 ` [PATCH 3/3] ARM: OMAP: N800: " jarkko.nikula
2007-11-05 13:15 ` [PATCH/RFC 0/3 rev 2] " Jarkko Nikula
2007-11-05 13:15 ` [PATCH 1/3] ARM: OMAP: Add helper module for board specific I2C bus registration Jarkko Nikula
2007-11-05 13:15 ` [PATCH 2/3] ARM: OMAP: Use I2C bus registration helper Jarkko Nikula
2007-11-05 13:15 ` [PATCH 3/3] ARM: OMAP: N800: " Jarkko Nikula
-- strict thread matches above, loose matches on Subject: below --
2007-11-07 10:54 [PATCH/RFC 0/3 rev 3] " Jarkko Nikula
2007-11-07 10:54 ` [PATCH 2/3] ARM: OMAP: Use " Jarkko Nikula
2007-11-08 12:42 ` Nishanth Menon
2007-11-09 7:14 ` Jarkko Nikula
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