1. 55d98a1 tegra20: rename tegra2 -> tegra20 by Allen Martin · Fri Aug 31 08:30:00 2012 +0000[Renamed (92%) from arch/arm/include/asm/arch-tegra2/timer.h]
  2. 28cb161 Tegra2: Add microsecond timer function by Simon Glass · Tue Aug 30 06:23:12 2011 +0000