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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>
alistair/sunxi64-5.4-dsi
Sylwester Nawrocki 2019-06-19 11:39:25 +02:00 committed by Stephen Boyd
parent a188339ca5
commit 2f25528e4e
2 changed files with 39 additions and 3 deletions
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23
drivers/clk/clk-bulk.c
View File

@ -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))

19
include/linux/clk.h
View File

@ -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)
{