TWIM drivers don't work with power management runtime enabled

[RobHel]

Hello. I'm trying to get my I2C peripheral (I2C1) working with Zephyr's Power Management feature. If I make my i2c1 peripheral compatible with "nordic,nrf-twi" the driver works, but the driver does not support Zephyr's CONFIG_PM functionality. 

If I make the driver compatible with "nordic,nrf-twim", which does support Zephyr's CONFIG_PM functionality, the driver does not work at all. Line 153 in i2c_nrfx_twim.c:

ret = k_sem_take(&dev_data->completion_sync, I2C_TRANSFER_TIMEOUT_MSEC);

assigns -EAGAIN to ret. Increasing the I2C_TRANSFER_TIMEOUT_MSEC doesn't fix the problem, so it appears the semaphore gets reset during the waiting period. 

Has the twim driver been tested and validated with CONFIG_PM=y?

My *-pinctrl.dtsi file and .dts file snippet are attached.

Thanks,

Rob

[RobHel]

To add onto this, I can confirm the dev_data->completion_sync semaphore is getting corrupted. At line 60 in i2c_nrfx_twim.c, it is correct with a count of zero and a limit of 1 as shown below.

However, at line 153 the count and limit are clearly corrupted. 

[RobHel]

The pointer to dev_data gets corrupted in the i2c_nrfx_twim_transfer function. See the below two images when the completion_sync sem is valid and when it is not.