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| author | Sylwester Nawrocki <s.nawrocki@samsung.com> | 2019-06-19 11:39:25 +0200 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2019-06-25 14:28:01 -0700 |
| commit | 2f25528e4edddc6eddd42c8d41c9c9e341c8b9da (patch) | |
| tree | dd46a675c85fa3225bb83984716a4b862105a9e2 | |
| parent | a188339ca5a396acc588e5851ed7e19f66b0ebd9 (diff) | |
| download | lwn-2f25528e4edddc6eddd42c8d41c9c9e341c8b9da.tar.gz lwn-2f25528e4edddc6eddd42c8d41c9c9e341c8b9da.zip | |
clk: Add clk_bulk_get_optional() function
clk_bulk_get_optional() allows to get a group of clocks where one
or more is optional. For a not available clock, e.g. not specifed
in the clock consumer node in DT, its respective struct clk pointer
will be NULL. This allows for operating on a group of returned
clocks (struct clk_bulk_data array) with existing clk_bulk* APIs.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
| -rw-r--r-- | drivers/clk/clk-bulk.c | 23 | ||||
| -rw-r--r-- | include/linux/clk.h | 19 |
2 files changed, 39 insertions, 3 deletions
diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c index 06499568cf07..524bf9a53098 100644 --- a/drivers/clk/clk-bulk.c +++ b/drivers/clk/clk-bulk.c @@ -75,8 +75,8 @@ void clk_bulk_put(int num_clks, struct clk_bulk_data *clks) } EXPORT_SYMBOL_GPL(clk_bulk_put); -int __must_check clk_bulk_get(struct device *dev, int num_clks, - struct clk_bulk_data *clks) +static int __clk_bulk_get(struct device *dev, int num_clks, + struct clk_bulk_data *clks, bool optional) { int ret; int i; @@ -88,10 +88,14 @@ int __must_check clk_bulk_get(struct device *dev, int num_clks, clks[i].clk = clk_get(dev, clks[i].id); if (IS_ERR(clks[i].clk)) { ret = PTR_ERR(clks[i].clk); + clks[i].clk = NULL; + + if (ret == -ENOENT && optional) + continue; + if (ret != -EPROBE_DEFER) dev_err(dev, "Failed to get clk '%s': %d\n", clks[i].id, ret); - clks[i].clk = NULL; goto err; } } @@ -103,8 +107,21 @@ err: return ret; } + +int __must_check clk_bulk_get(struct device *dev, int num_clks, + struct clk_bulk_data *clks) +{ + return __clk_bulk_get(dev, num_clks, clks, false); +} EXPORT_SYMBOL(clk_bulk_get); +int __must_check clk_bulk_get_optional(struct device *dev, int num_clks, + struct clk_bulk_data *clks) +{ + return __clk_bulk_get(dev, num_clks, clks, true); +} +EXPORT_SYMBOL_GPL(clk_bulk_get_optional); + void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks) { if (IS_ERR_OR_NULL(clks)) diff --git a/include/linux/clk.h b/include/linux/clk.h index f689fc58d7be..1b50e7d1675c 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -332,6 +332,19 @@ int __must_check clk_bulk_get(struct device *dev, int num_clks, */ int __must_check clk_bulk_get_all(struct device *dev, struct clk_bulk_data **clks); + +/** + * clk_bulk_get_optional - lookup and obtain a number of references to clock producer + * @dev: device for clock "consumer" + * @num_clks: the number of clk_bulk_data + * @clks: the clk_bulk_data table of consumer + * + * Behaves the same as clk_bulk_get() except where there is no clock producer. + * In this case, instead of returning -ENOENT, the function returns 0 and + * NULL for a clk for which a clock producer could not be determined. + */ +int __must_check clk_bulk_get_optional(struct device *dev, int num_clks, + struct clk_bulk_data *clks); /** * devm_clk_bulk_get - managed get multiple clk consumers * @dev: device for clock "consumer" @@ -718,6 +731,12 @@ static inline int __must_check clk_bulk_get(struct device *dev, int num_clks, return 0; } +static inline int __must_check clk_bulk_get_optional(struct device *dev, + int num_clks, struct clk_bulk_data *clks) +{ + return 0; +} + static inline int __must_check clk_bulk_get_all(struct device *dev, struct clk_bulk_data **clks) { |