+-----------
+The Nvidia tegra194 HTE provider driver implements two GTE
+(Generic Timestamping Engine) instances 1) GPIO GTE and 2) LIC IRQ GTE. The
+both GTEs instances get the timestamp from the system counter TSC which has
+31.25MHz clock rate, and the driver converts clock tick rate to nano seconds
+before storing it as timestamp value.
+
+GPIO GTE
+--------
+
+This GTE instance timestamps GPIO in real time, for that to happen GPIO
+needs to be configured as input and IRQ needs to ba enabled. The only always on
+(AON) gpio controller instance supports timestamping GPIOs in realtime and it