From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Warren <swarren@wwwdotorg.org>
Date: Wed, 25 Feb 2015 16:10:51 -0700
Subject: [U-Boot] [PATCH 04/20] tegra: Provide more accurate microsecond
	time
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 <1424212195-7501-5-git-send-email-sjg@chromium.org>
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On 02/17/2015 03:29 PM, Simon Glass wrote:
> Add an implementation of the timer functions for tegra, so that timing
> is more accurate. Tegra has a 1 microsecond timer for this purpose.

I'm a bit confused about this:

include/configs/tegra-common.h:32:#define CONFIG_SYS_TIMER_COUNTER 
NV_PA_TMRUS_BASE

lib/time.c:

#ifdef CONFIG_SYS_TIMER_COUNTER
unsigned long notrace timer_read_counter(void)
{
#ifdef CONFIG_SYS_TIMER_COUNTS_DOWN
         return ~readl(CONFIG_SYS_TIMER_COUNTER);
#else
         return readl(CONFIG_SYS_TIMER_COUNTER);
#endif
}

Doesn't that provide the same set of features, without requiring 
Tegra-specific code?