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authorSekhar Nori <nsekhar@ti.com>2009-11-23 15:27:15 +0530
committerKevin Hilman <khilman@deeprootsystems.com>2010-02-04 13:29:41 -0800
commit5b5052e32dc53e6e76da188c547f14c4e5e35624 (patch)
tree197e196c78132bd6998ddfcd8708ec31bbcedfcb
parent60cd02e1f4a1574c26c9ae8d29d63bd3d179c0c2 (diff)
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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.h7
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__ */