From: Guenter Roeck <guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
To: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
Cc: "linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Michael Lawnick <ml.lawnick-Mmb7MZpHnFY@public.gmane.org>,
Rodolfo Giometti
<giometti-AVVDYK/kqiJWk0Htik3J/w@public.gmane.org>
Subject: Re: Driver for pca9541 bus master selector
Date: Wed, 29 Sep 2010 06:54:01 -0700 [thread overview]
Message-ID: <20100929135401.GA11771@ericsson.com> (raw)
In-Reply-To: <20100929091928.16256bb7-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
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
next prev parent reply other threads:[~2010-09-29 13:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-28 14:33 Driver for pca9541 bus master selector Guenter Roeck
[not found] ` <20100928143302.GA7593-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
2010-09-28 15:16 ` Jean Delvare
[not found] ` <20100928171607.395f7736-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2010-09-28 16:07 ` Guenter Roeck
[not found] ` <20100928160746.GB7976-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
2010-09-28 16:42 ` Jean Delvare
[not found] ` <20100928184215.00f82717-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2010-09-28 17:16 ` Guenter Roeck
[not found] ` <20100928171627.GA8415-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
2010-09-29 7:19 ` Jean Delvare
[not found] ` <20100929091928.16256bb7-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2010-09-29 13:54 ` Guenter Roeck [this message]
[not found] ` <20100929135401.GA11771-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
2010-09-30 5:59 ` Michael Lawnick
[not found] ` <4CA42750.5020500-Mmb7MZpHnFY@public.gmane.org>
2010-09-30 7:48 ` Guenter Roeck
2010-10-13 16:05 ` Guenter Roeck
2010-10-13 15:45 ` Guenter Roeck
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