Some devices might need to access the current available range of a clock to discover their capabilities. Let's add those accessors.
Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/clk/clk.c | 30 ++++++++++++++++++++++++++++++ include/linux/clk.h | 16 ++++++++++++++++ 2 files changed, 46 insertions(+)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 8c1d04db990d..b7307d4f090d 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2407,6 +2407,36 @@ int clk_set_max_rate(struct clk *clk, unsigned long rate) } EXPORT_SYMBOL_GPL(clk_set_max_rate);
+long clk_get_min_rate(struct clk *clk) +{ + unsigned long min_rate, max_rate; + + if (!clk) + return 0; + + clk_prepare_lock(); + clk_core_get_boundaries(clk->core, &min_rate, &max_rate); + clk_prepare_unlock(); + + return min_rate; +} +EXPORT_SYMBOL_GPL(clk_get_min_rate); + +long clk_get_max_rate(struct clk *clk) +{ + unsigned long min_rate, max_rate; + + if (!clk) + return 0; + + clk_prepare_lock(); + clk_core_get_boundaries(clk->core, &min_rate, &max_rate); + clk_prepare_unlock(); + + return max_rate; +} +EXPORT_SYMBOL_GPL(clk_get_max_rate); + /** * clk_get_parent - return the parent of a clk * @clk: the clk whose parent gets returned diff --git a/include/linux/clk.h b/include/linux/clk.h index 31ff1bf1b79f..6f0c00ddf3ac 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -709,6 +709,22 @@ int clk_set_min_rate(struct clk *clk, unsigned long rate); */ int clk_set_max_rate(struct clk *clk, unsigned long rate);
+/** + * clk_get_min_rate - get the minimum clock rate for a clock source + * @clk: clock source + * + * Returns the minimum rate or negative errno. + */ +long clk_get_min_rate(struct clk *clk); + +/** + * clk_get_max_rate - get the maximum clock rate for a clock source + * @clk: clock source + * + * Returns the maximum rate or negative errno. + */ +long clk_get_max_rate(struct clk *clk); + /** * clk_set_parent - set the parent clock source for this clock * @clk: clock source