Commit 5b5052e3 authored by Sekhar Nori's avatar Sekhar Nori Committed by Kevin Hilman

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: default avatarSekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent 60cd02e1
...@@ -11,7 +11,12 @@ ...@@ -11,7 +11,12 @@
#ifndef __ASM_ARCH_TIMEX_H #ifndef __ASM_ARCH_TIMEX_H
#define __ASM_ARCH_TIMEX_H #define __ASM_ARCH_TIMEX_H
/* The source frequency for the timers is the 27MHz clock */ /*
* 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 #define CLOCK_TICK_RATE 27000000
#endif /* __ASM_ARCH_TIMEX_H__ */ #endif /* __ASM_ARCH_TIMEX_H__ */
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