On Wed, Sep 29, 2010 at 03:19:28AM -0400, Jean Delvare wrote:
[ ... ]
>
> I was speaking of the PCA9540. I don't think anyone ever wrote a driver
> for the PCA9541. And in all honestly I don't think the new i2c-mux
> infrastructure is ready for this. It was written with single-master
> topologies in mind. You'll have to rethink a lot of things if you want
> to add support for "inverted" multiplexers. And I don't have the time
> to help, sorry.
>
Actually, the infrastructure works quite nicely. I use select_chan
to acquire the slave, and release_chan to initiate release.
It behaves like a one-channel multiplexer.
> I don't quite see the point of such chips, BTW. I2C supports
> multi-master already, so two masters talking to the same slave
> sequentially is already supported.
>
Tell that to our HW team, and to them:
http://www.lineagepower.com/oem/pdf/CPLI2C.pdf
Guenter
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