We use pin 4 to set our CHIP SELECT in order to perform spi_transceive.
We use the SPI protocol to "talk" between a microcontroller and the LSM6DSL component.
It is important to note that on software version 1.4.9 it works fine and when we put it on version 1.9.0 it does not work properly.
I tried to take from a link that I saw in this forum and put it in our code but it does not help.
The only difference that exists is between the two DTS files of the versions.
Attached DTS file of version 1.9.0 :