diff options
Diffstat (limited to 'include/linux/clk.h')
| -rw-r--r-- | include/linux/clk.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/include/linux/clk.h b/include/linux/clk.h index 9a6d04524b1a..fb5e097d8f72 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -78,10 +78,41 @@ struct clk_notifier_data { unsigned long new_rate; }; +/** + * clk_notifier_register: register a clock rate-change notifier callback + * @clk: clock whose rate we are interested in + * @nb: notifier block with callback function pointer + * + * ProTip: debugging across notifier chains can be frustrating. Make sure that + * your notifier callback function prints a nice big warning in case of + * failure. + */ int clk_notifier_register(struct clk *clk, struct notifier_block *nb); +/** + * clk_notifier_unregister: unregister a clock rate-change notifier callback + * @clk: clock whose rate we are no longer interested in + * @nb: notifier block which will be unregistered + */ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb); +/** + * clk_get_accuracy - obtain the clock accuracy in ppb (parts per billion) + * for a clock source. + * @clk: clock source + * + * This gets the clock source accuracy expressed in ppb. + * A perfect clock returns 0. + */ +long clk_get_accuracy(struct clk *clk); + +#else + +static inline long clk_get_accuracy(struct clk *clk) +{ + return -ENOTSUPP; +} + #endif /** |