**urgent** Problem with TWIM in newer Zephyr version

[GiulianoFranchetto]

Hi,

We just upgraded to the latest version of Zephyr, and all of our out-of-tree driver using I2C (TWIM) are now broken.

All the i2c_xxx function return -5 with a NACK from the slave.

I've checked the device tree and all the pins are correct.

The strange thing is that we are also using one sensor which has a in-tree driver, and this one is actually working.

Is there a breaking change on TWIM side of Zephyr that I'm not aware of ?

Regards

Giuliano

[GiulianoFranchetto]

I'm going to close this ticket as it is in discussion with Zephyr teams.

Long story short, when using the new "pin control" API, a default register configuration changes: the pin drive becomes S0S1 instead of S0D1.

In our case, this change broke the bus.

Adding nordic,drive-mode = <6>; to our pinctrl dtsi fixes the issue