diff options
Diffstat (limited to 'Documentation/rtc.txt')
-rw-r--r-- | Documentation/rtc.txt | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/Documentation/rtc.txt b/Documentation/rtc.txt index 1ef6bb88cd00..7c701b88d6d5 100644 --- a/Documentation/rtc.txt +++ b/Documentation/rtc.txt | |||
@@ -147,7 +147,7 @@ RTC class framework, but can't be supported by the older driver. | |||
147 | 147 | ||
148 | * RTC_AIE_ON, RTC_AIE_OFF, RTC_ALM_SET, RTC_ALM_READ ... when the RTC | 148 | * RTC_AIE_ON, RTC_AIE_OFF, RTC_ALM_SET, RTC_ALM_READ ... when the RTC |
149 | is connected to an IRQ line, it can often issue an alarm IRQ up to | 149 | is connected to an IRQ line, it can often issue an alarm IRQ up to |
150 | 24 hours in the future. | 150 | 24 hours in the future. (Use RTC_WKALM_* by preference.) |
151 | 151 | ||
152 | * RTC_WKALM_SET, RTC_WKALM_RD ... RTCs that can issue alarms beyond | 152 | * RTC_WKALM_SET, RTC_WKALM_RD ... RTCs that can issue alarms beyond |
153 | the next 24 hours use a slightly more powerful API, which supports | 153 | the next 24 hours use a slightly more powerful API, which supports |
@@ -175,10 +175,7 @@ driver returns ENOIOCTLCMD. Some common examples: | |||
175 | called with appropriate values. | 175 | called with appropriate values. |
176 | 176 | ||
177 | * RTC_ALM_SET, RTC_ALM_READ, RTC_WKALM_SET, RTC_WKALM_RD: the | 177 | * RTC_ALM_SET, RTC_ALM_READ, RTC_WKALM_SET, RTC_WKALM_RD: the |
178 | set_alarm/read_alarm functions will be called. To differentiate | 178 | set_alarm/read_alarm functions will be called. |
179 | between the ALM and WKALM, check the larger fields of the rtc_wkalrm | ||
180 | struct (like tm_year). These will be set to -1 when using ALM and | ||
181 | will be set to proper values when using WKALM. | ||
182 | 179 | ||
183 | * RTC_IRQP_SET, RTC_IRQP_READ: the irq_set_freq function will be called | 180 | * RTC_IRQP_SET, RTC_IRQP_READ: the irq_set_freq function will be called |
184 | to set the frequency while the framework will handle the read for you | 181 | to set the frequency while the framework will handle the read for you |