Linux Device Drivers Development

Naming convention

Every node must have a name in the form <name>[@<address>], where <name> is a string that can be up to 31 characters in length, and [@<address>] is optional, depending on whether the node represents an addressable device or not. <address> should be the primary address used to access the device. An example of device naming is as follows:

expander@20 { 
    compatible = "microchip,mcp23017"; 
    reg = <20>; 
    [...]        
}; 

Here is another example:

i2c@021a0000 { 
    compatible = "fsl,imx6q-i2c", "fsl,imx21-i2c"; 
    reg = <0x021a0000 0x4000>; 
    [...] 
}; 

On the other hand, the label is optional. Labeling a node is useful only if the node is intended to be referenced from a property of another node. You can see a label as a pointer to a node, as explained ...