diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/clk-private.h | 1 | ||||
| -rw-r--r-- | include/linux/clk-provider.h | 11 | ||||
| -rw-r--r-- | include/linux/clk.h | 17 |
3 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/clk-private.h b/include/linux/clk-private.h index 8138c94409f3..accb517e77e9 100644 --- a/include/linux/clk-private.h +++ b/include/linux/clk-private.h @@ -41,6 +41,7 @@ struct clk { unsigned long flags; unsigned int enable_count; unsigned int prepare_count; + unsigned long accuracy; struct hlist_head children; struct hlist_node child_node; unsigned int notifier_count; diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 7e59253b8603..16d182c28ce6 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -29,6 +29,7 @@ #define CLK_IS_BASIC BIT(5) /* Basic clk, can't do a to_clk_foo() */ #define CLK_GET_RATE_NOCACHE BIT(6) /* do not use the cached clk rate */ #define CLK_SET_RATE_NO_REPARENT BIT(7) /* don't re-parent on rate change */ +#define CLK_GET_ACCURACY_NOCACHE BIT(8) /* do not use the cached clk accuracy */ struct clk_hw; @@ -108,6 +109,13 @@ struct clk_hw; * which is likely helpful for most .set_rate implementation. * Returns 0 on success, -EERROR otherwise. * + * @recalc_accuracy: Recalculate the accuracy of this clock. The clock accuracy + * is expressed in ppb (parts per billion). The parent accuracy is + * an input parameter. + * Returns the calculated accuracy. Optional - if this op is not + * set then clock accuracy will be initialized to parent accuracy + * or 0 (perfect clock) if clock has no parent. + * * The clk_enable/clk_disable and clk_prepare/clk_unprepare pairs allow * implementations to split any work between atomic (enable) and sleepable * (prepare) contexts. If enabling a clock requires code that might sleep, @@ -139,6 +147,8 @@ struct clk_ops { u8 (*get_parent)(struct clk_hw *hw); int (*set_rate)(struct clk_hw *hw, unsigned long, unsigned long); + unsigned long (*recalc_accuracy)(struct clk_hw *hw, + unsigned long parent_accuracy); void (*init)(struct clk_hw *hw); }; @@ -433,6 +443,7 @@ struct clk *clk_get_parent_by_index(struct clk *clk, u8 index); unsigned int __clk_get_enable_count(struct clk *clk); unsigned int __clk_get_prepare_count(struct clk *clk); unsigned long __clk_get_rate(struct clk *clk); +unsigned long __clk_get_accuracy(struct clk *clk); unsigned long __clk_get_flags(struct clk *clk); bool __clk_is_prepared(struct clk *clk); bool __clk_is_enabled(struct clk *clk); diff --git a/include/linux/clk.h b/include/linux/clk.h index 9a6d04524b1a..0dd91148165e 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -82,6 +82,23 @@ int clk_notifier_register(struct clk *clk, struct notifier_block *nb); 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 /** |