Merge pull request #124 from bjackman/cpufreq-iter-domains

Add iter_domains method to cpufreq module

devlib/module/cpufreq.py

@@ -421,3 +421,14 @@ class CpufreqModule(Module):
         sysfile = '/sys/devices/system/cpu/{}/cpufreq/affected_cpus'.format(cpu)
 
         return [int(c) for c in self.target.read_value(sysfile).split()]
+
+    def iter_domains(self):
+        """
+        Iterate over the frequency domains in the system
+        """
+        cpus = set(range(self.target.number_of_cpus))
+        while cpus:
+            cpu = iter(cpus).next()
+            domain = self.target.cpufreq.get_domain_cpus(cpu)
+            yield domain
+            cpus = cpus.difference(domain)