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Subject: [Bug 195009] [patch]: [arm] Use 400 kHz as the default OMAP4 I2C bus
 speed
Date: Sun, 16 Nov 2014 04:16:02 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195009

Ian Lepore <ian@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|Needs Triage                |In Discussion
                 CC|                            |ian@FreeBSD.org

--- Comment #1 from Ian Lepore <ian@FreeBSD.org> ---
This isn't a great fix since the bus can actually run faster than 400KHz.  The
real problem is that we've long lacked a way of configuring the speed of each
i2c bus in a system, so I attacked the problem from that angle.  The patchset
is available for review or download here at 

 https://reviews.freebsd.org/D1174

This will allow you to set the bus speed from device hints, from the FDT data,
or from a loader.conf file using for example dev.iicbus.0.frequency=400000, or
it can be changed on the fly using a sysctl with the same oid/path.

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