diff options
Diffstat (limited to 'Documentation/rtc.txt')
| -rw-r--r-- | Documentation/rtc.txt | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/rtc.txt b/Documentation/rtc.txt index c931d613f64..e20b19c1b60 100644 --- a/Documentation/rtc.txt +++ b/Documentation/rtc.txt @@ -180,9 +180,10 @@ driver returns ENOIOCTLCMD. Some common examples: * RTC_IRQP_SET, RTC_IRQP_READ: the irq_set_freq function will be called to set the frequency while the framework will handle the read for you since the frequency is stored in the irq_freq member of the rtc_device - structure. Also make sure you set the max_user_freq member in your - initialization routines so the framework can sanity check the user - input for you. + 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. If all else fails, check out the rtc-test.c driver! |