[PATCH v2 1/4] dt-bindings: arm: qcom: Add Samsung Galaxy Express

[Rudraksha Gupta]

 > Where did the "att" come from in the compatible. Is this some carrier 
specific model of the phone?

This is the code name for the device. Since there are usually multiple 
variants of a device, using the code name differentiates between those 
variants. For example, if I left this as "samsung,express", it would be 
unclear if I am referring to the GT-I8730 (code name: expresslte) or the 
SGH-I437 model. This is typically done in postmarketOS: 
https://wiki.postmarketos.org/wiki/Devices and XDA developers. I believe 
it is a carrier specific model of the Samsung Galaxy Express.