MCU is this https://github.com/zephyrproject-rtos/zephyr/tree/d6e3f22fddccf4b542cb5ec780440cb629c12290/arch/arm/soc/st_stm32/stm32f1
Using this board https://github.com/zephyrproject-rtos/zephyr/tree/d6e3f22fddccf4b542cb5ec780440cb629c12290/boards/arm/stm32_min_dev
Seems it completely off i2c devices so added to board dts
To make it work. Together with bug fixed about DTS https://github.com/zephyrproject-rtos/zephyr/issues/7248 I have now I2C device created. So code is work now.
But still no activities on device pins. Checked all the pins with logick analser and found nothing.
I suspect some GPIO setup required.