OF_finddevice — find node in device tree

       This manual page was written by Oleksandr Tymoshenko <gonzo@FreeBSD.org>.

Debian                                            April 9, 2018                                 OF_FINDDEVICE(9)

       The  return  value  should  only  be  checked  with  equality  operators (equal to, not equal to) and not
       relational comparison (less than, greater than ).  There is a discrepancy between IEEE 1275 standard  and
       FreeBSD's  internal  representation of a phandle: IEEE 1275 requires the return value of this function to
       be -1 if the path is not found.  But phandle_t is an unsigned type, so it cannot be relationally compared
       with -1 or 0, this comparison is always true or always false.

OF_finddevice() returns the phandle for the node specified by the path.  Returns -1 if the path cannot be
       found in the tree.

           phandle_t root, i2c;

           root = OF_finddevice("/");
           i2c = OF_finddevice("/soc/axi/i2c@a0e0000");
           if (i2c != -1) {
               ...
           }

       OF_finddevice — find node in device tree

OF_child(9) OF_parent(9) OF_peer(9)

#include<dev/ofw/ofw_bus.h>#include<dev/ofw/ofw_bus_subr.h>phandle_tOF_finddevice(constchar*path);