Linux Device Drivers Development

Device tree mechanisms

A DT is enabled in the kernel by setting the CONFIG_OF option to Y. In order to pull the DT API from within your driver, you must add the following headers:

#include <linux/of.h> 
#include <linux/of_device.h> 

A DT supports a few data types. Let's have a look at them with a sample node description:

/* This is a comment */ 
// This is another comment 
node_label: nodename@reg{ 
   string-property = "a string"; 
   string-list = "red fish", "blue fish"; 
   one-int-property = <197>; /* One cell in this property */ 
   int-list-property = <0xbeef 123 0xabcd4>; /*each number(cell)is a                          *32 bit integer(uint32). *There are 3 cells in   *this property */ mixed-list-property = "a string", <0xadbcd45>, <35>, [0x01 0x23 0x45] byte-array-property ...