Each clock domain export a sysctl dev.clkdom.unit.clocks containing all the
clocks that they provide. Each clocks are exported under the root node 'clock.' and have the following children nodes : - frequency - parent (The selected parent, if any) - parents (The list of parents, if any) - childrens (The list of childrens, if any) - enable_cnt (The enabled counter) This give us the possibility to examine clocks at runtime and make graph of the clock flow.