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rtc: update documentation wrt irq_set_freq

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Document the proper use of the irq_set_freq function.

Signed-off-by: Mike Frysinger <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: David Brownell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mike Frysinger 2008-02-06 01:38:56 -08:00 • committed by Linus Torvalds
commit 8a0ba4e017
1 changed files with 2 additions and 2 deletions
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4
Documentation/rtc.txt
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@ -182,8 +182,8 @@ driver returns ENOIOCTLCMD. Some common examples:
since the frequency is stored in the irq_freq member of the rtc_device
structure. Your driver needs to initialize the irq_freq member during
init. Make sure you check the requested frequency is in range of your
hardware in the irq_set_freq function. If you cannot actually change
the frequency, just return -ENOTTY.
hardware in the irq_set_freq function. If it isn't, return -EINVAL. If
you cannot actually change the frequency, do not define irq_set_freq.
If all else fails, check out the rtc-test.c driver!