Hi Leif, > As you see, I have more questions than answers; any background information, > pointers to previous discussions and opinions would be very much appreciated. This driver was not touched often in the last times, so I am afraid just posting to linux-i2c won't help much. I would suggest to have a look in the git-history (it's also online if you don't have it [1]). There you can find descriptions of the patches touching this driver; using the subject line in your favourite search engine should then point you to the discussions around it. Also, you get names of the people involved, so if there are still questions left, you can set them to CC when asking further questions (and in case you go back renough in time, you actually might find me again :D But it's quite some time I touched this driver). Hope this helps, Wolfram [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/i2c/busses/i2c-mpc.c
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