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rtc: update documentation wrt irq_set_freq
Document the proper use of the irq_set_freq function. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -182,8 +182,8 @@ driver returns ENOIOCTLCMD. Some common examples:
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since the frequency is stored in the irq_freq member of the rtc_device
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since the frequency is stored in the irq_freq member of the rtc_device
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structure. Your driver needs to initialize the irq_freq member during
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structure. Your driver needs to initialize the irq_freq member during
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init. Make sure you check the requested frequency is in range of your
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init. Make sure you check the requested frequency is in range of your
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hardware in the irq_set_freq function. If you cannot actually change
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hardware in the irq_set_freq function. If it isn't, return -EINVAL. If
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the frequency, just return -ENOTTY.
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you cannot actually change the frequency, do not define irq_set_freq.
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If all else fails, check out the rtc-test.c driver!
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If all else fails, check out the rtc-test.c driver!
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