pytests: Add test_devfreq.py for testing the memory devfreq driver

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>

pytests/test_devfreq.py

+import os
+
+
+def test_devfreq_ddr():
+    "Ensure ddr devfreq driver is present"
+    assert(os.path.exists('/sys/class/devfreq/3d400000.memory-controller'))
+
+
+def test_devfreq_freq():
+    assert("25000000" in open("/sys/class/devfreq/3d400000.memory-controller/min_freq").read())
+    assert("800000000" in open("/sys/class/devfreq/3d400000.memory-controller/max_freq").read())