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| author | Sekhar Nori <nsekhar@ti.com> | 2009-11-23 15:27:15 +0530 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2010-02-04 13:29:41 -0800 |
| commit | 5b5052e32dc53e6e76da188c547f14c4e5e35624 (patch) | |
| tree | 197e196c78132bd6998ddfcd8708ec31bbcedfcb | |
| parent | 60cd02e1f4a1574c26c9ae8d29d63bd3d179c0c2 (diff) | |
| download | linux-5b5052e32dc53e6e76da188c547f14c4e5e35624.tar.gz linux-5b5052e32dc53e6e76da188c547f14c4e5e35624.tar.bz2 linux-5b5052e32dc53e6e76da188c547f14c4e5e35624.zip | |
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>
| -rw-r--r-- | arch/arm/mach-davinci/include/mach/timex.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm/mach-davinci/include/mach/timex.h b/arch/arm/mach-davinci/include/mach/timex.h index 52827567841d..9b885298f106 100644 --- a/arch/arm/mach-davinci/include/mach/timex.h +++ b/arch/arm/mach-davinci/include/mach/timex.h @@ -11,7 +11,12 @@ #ifndef __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 #endif /* __ASM_ARCH_TIMEX_H__ */ |