Hi,

Thanks Wolfram to help bring this up,

Sure thing! It would be sad to see this work bitrot.

This driver was tested with Aspeed ast2500 and we have tried many way to
avoid using slave_enable() to toggle slave mode but there is no progress.

I see. I also can't help you there. I have neither experience with nor
access to this HW.

Our expectation is still to have this driver upstream'ed and I'm thinking
about testing this driver on other HW and re-post the driver.

That sounds like a good plan.

I have to admit that you are all right with the above comments. The fact is
we still not be able to find any way to solve this differently. We don't own
this HW and dont know what happen on this particular issue. The SCL clock
stretching on this HW does not work as expected and the slave_enable() is
the only solution for now. I hope if someone could help with the issue as
well.

From this distance, it looks like HW access and a logic analyzer might
be helpful in understanding the behaviour. Pity that you don't own the
HW.

Good luck nonetheless!

   Wolfram