device_get_binding() return NULL

[mejtejt]

Hi,
This line of code dev = device_get_binding("BQ274XX"); always returns NULL even though I can clearly see in debugger that content is there :

Does anyone have a clue why is this happening? This is a whole section of previous line and breakpoint is at dev=...:

  dev = device_get_binding("BQ274XX");
  if (!dev) {
    std::cout << "Error while initializing BQ274XX" << std::endl;
  }

BQ274XX is configured in .dts file :

Code is building fine with all additional config lines like CONFIG_I2C, CONFIG_I2C, CONFIG_SENSOR, CONFIG_BQ274XX in a prj.conf file.
Board I'm using is a prototype but with STM32L462VE MCU and mostly of <st/l4/stm32l462Xe.dtsi> device tree config.
Not sure if I gave all the necessary info.
Thanks, cheers.

[mbolivar-nordic]

There are two reasons why device_get_binding() may return NULL:

1. There is no such device
2. The device's initialization function failed

Since from your report it looks like there is such a device, I assume its initialization function failed. You will need to add printlines or attach a debugger to that function and step through to figure out why.

[mejtejt]

It was device's initialization function failure. More precisely, BQ27421 ID register couldn't be read because clock frequency was to fast. Had to switch it to I2C_BITRATE_STANDARD.
Thanks!