diff --git a/devlib/module/cpufreq.py b/devlib/module/cpufreq.py
index 3a3eec9..a0d77f6 100644
--- a/devlib/module/cpufreq.py
+++ b/devlib/module/cpufreq.py
@@ -408,3 +408,14 @@ class CpufreqModule(Module):
         """
         return self.target._execute_util('cpufreq_trace_all_frequencies', as_root=True)
 
+    @memoized
+    def get_domain_cpus(self, cpu):
+        """
+        Get the CPUs that share a frequency domain with the given CPU
+        """
+        if isinstance(cpu, int):
+            cpu = 'cpu{}'.format(cpu)
+
+        sysfile = '/sys/devices/system/cpu/{}/cpufreq/affected_cpus'.format(cpu)
+
+        return [int(c) for c in self.target.read_value(sysfile).split()]