linux/arch/arm/mach-davinci/include/mach/timex.h
Sekhar Nori 5b5052e32d davinci: explain CLOCK_TICK_RATE of 27MHz in include/mach/timex.h
Leave a comment explaining the constant value of 27Mhz used
in include/mach/timex.h for all DaVinci platforms. Many of
the platforms actually run at 24MHz timer frequency (Eg.
EVMs of DM355, DM365 and OMAP-L1).

The comment also serves as a porting alert.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
2010-02-04 13:29:41 -08:00

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C

/*
* DaVinci timer defines
*
* Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
*
* 2007 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#ifndef __ASM_ARCH_TIMEX_H
#define __ASM_ARCH_TIMEX_H
/*
* Alert: Not all timers of the DaVinci family run at a frequency of 27MHz,
* but we should be fine as long as CLOCK_TICK_RATE or LATCH (see include/
* linux/jiffies.h) are not used directly in code. Currently none of the
* code relevant to DaVinci platform depends on these values directly.
*/
#define CLOCK_TICK_RATE 27000000
#endif /* __ASM_ARCH_TIMEX_H__ */