From: Mike Frysinger Document the proper use of the irq_set_freq function. Signed-off-by: Mike Frysinger Cc: Alessandro Zummo Cc: David Brownell Signed-off-by: Andrew Morton --- Documentation/rtc.txt | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff -puN Documentation/rtc.txt~rtc-update-documentation-wrt-irq_set_freq Documentation/rtc.txt --- a/Documentation/rtc.txt~rtc-update-documentation-wrt-irq_set_freq +++ a/Documentation/rtc.txt @@ -182,8 +182,8 @@ driver returns ENOIOCTLCMD. Some common 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! _