Added CPU freq measurements

device.inc.php

@@ -278,6 +278,42 @@ function device_cputop_async(string $atf_host, string $device) : Amp\Promise
   });
 }
 
+function device_cpu_freq_min_async(string $atf_host, string $device, int $core_index = 0) : Amp\Promise
+{
+  return device_cpu_measure_async($atf_host, $device, "cpuinfo_min_freq", $core_index); 
+}
+
+function device_cpu_freq_max_async(string $atf_host, string $device, int $core_index = 0) : Amp\Promise
+{
+  return device_cpu_measure_async($atf_host, $device, "cpuinfo_max_freq", $core_index); 
+}
+
+function device_cpu_freq_cur_async(string $atf_host, string $device, int $core_index = 0) : Amp\Promise
+{
+  return device_cpu_measure_async($atf_host, $device, "scaling_cur_freq", $core_index); 
+}
+
+function device_cpu_measure_async(string $atf_host, string $device, string $metric, int $core_index) : Amp\Promise
+{
+  return Amp\call(function() use($atf_host, $device, $metric, $core_index) {
+    //NOTE: on current devices 16 thermal zone are responsible for GPU temperature probing
+    list($code, $lines) = yield host_exec_async($atf_host, "%{adb}% -s $device shell cat /sys/devices/system/cpu/cpu$core_index/cpufreq/$metric", DEPLOY_OPT_ERR_OK, 1);
+
+    if($code !== 0)
+      return 0;
+
+    foreach($lines as $idx => $line)
+    {
+      $line = trim($line);
+      if(!$line)
+        continue;
+      return intval($line);
+    }
+
+    return 0;
+  });
+}
+
 function device_temperature_async(string $atf_host, string $device) : Amp\Promise
 {
   return Amp\call(function() use($atf_host, $device) {