From: MikeB <mabnhdev@gmail.com>
To: Peter Rosin <peda@axentia.se>
Cc: linux-i2c@vger.kernel.org
Subject: Re: Looking for guidance to support 74CBTLV3253 mux
Date: Fri, 11 Nov 2016 06:47:12 -0500 [thread overview]
Message-ID: <CAAuRgKAUNwnGRsfWb=H84svvzWKrCZq5GpBn7Xah47M0LcxOrQ@mail.gmail.com> (raw)
In-Reply-To: <f34feb2c-ca27-6b10-e783-aa70e58d99fe@axentia.se>
Thank you for the informative reply. I was unfamiliar with the new
mux and parent locking schemes. They do make the solution for this
problem much easier to deal with. I'm working with release 4.4
(Ubuntu Xenial), so the mux/parent locking hadn't shown up on my radar
yet. Unfortunately, the target release for my work is and will remain
4.4 for a while.
Regards, Mike
On Thu, Nov 10, 2016 at 8:01 AM, Peter Rosin <peda@axentia.se> wrote:
>> There is however one requirement, the CPLD-mux must be "mux-locked"
>> as explained in Documentation/i2c/i2c-topology. Otherwise accesses
>> to devices behind that mux will lock the PCA9547 mux for the full
>> duration of the transaction and thus lock out any attempts to update
>> the CPLD mux as part of the transaction.
next prev parent reply other threads:[~2016-11-11 11:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-10 11:59 Looking for guidance to support 74CBTLV3253 mux MikeB
2016-11-10 12:52 ` Peter Rosin
2016-11-10 13:01 ` Peter Rosin
2016-11-11 11:47 ` MikeB [this message]
2016-11-11 12:04 ` Peter Rosin
2016-11-11 12:18 ` Peter Rosin
2016-11-11 12:23 ` MikeB
2016-11-20 8:53 ` Peter Rosin
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